Answer:
the option will be no.3
Explanation:
why? because I said so
What is the reason for having an engineering design process?
A. To be able to develop the most successful engineering product
B. To complete a scientific experiment
C. It’s the law of engineering.
D. The products will sell for more money.
1Table salt is a compound made of sodium and chlorine
atoms .From the table, what can you conclude about the properties of
compounds and the elements they are made of?
Some Properties of Three Substances
Sodium
Chlorine
gas
solid
green
silver
Property
State (at room temperature)
Color
Toxicity
poisonous
poisonous
Table salt
solid
white
not
poisonous
Answer:
This question is to vague. PS: what are you talking about?
Explanation:
This question is to vague. PS: what are you talking about?
calculate the molar concentration of a 3.0% mass percent concentration of h2o2. you can assume the density of the solution is 1.00 g/ml. (hint: start with 1.00 kg of solution)
Solution would be 0.88mol/l.
What is a solution?Solution is a homogeneous mixture of a one or more solutes dissolved in a solvent.
solvent: substance in which solute dissolves to produce a homogeneous mixture
solute: substance that dissolves in solvent to produce a homogeneous mixture
Note that solvent is the substance that is present in greatest amount.
Many different kinds of the solutions exist, for example, a solute can be a gas, a liquid or a solid. Solvents can also be the gases, liquids or solids.
Life processes depend in the large part on solutions. Oxygen from lungs goes into solution in blood plasma, unites chemically with the hemoglobin in the red blood cells, and is released to the body tissues. The products of digestion also are carried in the solution to the different parts of the body.
The ability of liquids to dissolve the other fluids or solids has many practical applications. Chemists take the advantage of differences in solubility to separate and purify materials and to carry out chemical analysis. Most chemical reactions occur in the solution and are influenced by the solubilities of the reagents. Materials for chemical manufacturing equipment are selected to resist solvent action of their contents.
Solution would contain 30g h2o2 per 1000g of solution. Since the molecule of h2o2 is 34g/mol then 30g would be,
30g/(30g/mol) = 0.88mol
So the solution would be 0.88mol/l.
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6. A 5.0 g sample of water has a volume of 5 mL. What is the density of the water?
Answer:
1g/
Explanation:
density=mass÷volume
5g÷5ml
1g/m
Does the pelvic bone support the intestines?
Yes, the pelvic bone support the intestines.
The pelvis, also known as the bony pelvis or the pelvic girdle, is a complex of bones that connects the trunk to the legs, supports and balances the trunk, and houses and supports the intestines, urinary bladder, and internal sex organs. It is also known as the "basin" or "bony pelvis" in human anatomy.
Major organs are located in the pelvic region, hidden by layers of muscles. The primary digestive organs, the intestines, are some of the most crucial. Bloating, constipation, or diarrhea, which are IBS symptoms, can cause pressure and pain in the pelvic area.
Therefore, yes the pelvic bone support the intestines.
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One isotope of a metallic element has the mass number 64 and 34 neutrons in the nucleus. the cation derived from the isotope has 28 electrons. what is the atomic number?
One isotope of a metallic element has the mass number 64 and 34 neutrons in the nucleus. the cation derived from the isotope has 28 electrons. So the atomic number will be 30.
Mass number of isotope = 64
Number of neutrons = 34
So number of protons = 64 - 34 = 30
Hence atomic number of metal = 30
Thus metal is = zinc
Now as it is forming cation with 28 electrons it means it has lost two electrons so it must have a dipositive charge.
The symbol of metal ion will be Zn^+2
The number of protons in an atom's nucleus or the number of electrons in an electrically neutral atom is the atomic number of that atom. An atom of sodium, for instance, has 11 protons and 11 electrons. Therefore, the atomic number of the Na atom is equal to the sum of its protons and electrons, or 11.
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Line a is parallel to line b with a transversal of line c. Find m∠4 if m∠8 = 65.
TRUE OR FALSE In the space provided, write "true" if the sentence is true. Write "false" if the sentence is false.
1. Weight is a measure of the pull of gravity on an object.
2. Scientists use English units of measurement.
3. The prefix centi- stands for one hundredth (1/100).
4. A graduate is used to measure mass. 5. The basic unit of length in the metric system is the meter.
6. Volume is a measure of the amount of matter in an object.
7. One kilogram is less than one gram.
8. A measurement has two parts.
9. A unit is an amount used to measure something.
10. Most countries use the metric system.
Based on measurements, the following statements are described as True or False:
1. Weight is a measure of the pull of gravity on an object is True.
2. Scientists use English units of measurement is False.
3. The prefix centi- stands for one hundredth (1/100) is True.
4. A graduate is used to measure mass is False.
5. The basic unit of length in the metric system is the meter is True.
6. Volume is a measure of the amount of matter in an object is False.
7. One kilogram is less than one gram is False.
8. A measurement has two parts is True.
9. A unit is an amount used to measure something is True.
10. Most countries use the metric system. is True.
What is weight of a substance?The weight of a substance is the pull of the gravity on the body.
The weight of a body is the product of the mass of the body and the acceleration due to gravity.
In measurements of the the properties of objects, the universally accepted unit used by scientists is the SI Units of measurement.
The prefix centi- used in measurements such as centimeter stands for one hundredth (1/100).
When measuring the mass of an object, a balance is used to measure the mass.
The basic unit of length in the metric system is the meter.
Mass is a measure of the amount of matter in an object whereas volume is the amount of space a given mass of the object occupies.
The unit of measuring mass is kilogram. One kilogram is equal to 1000 grams.
A measurement has two parts; a number and the unit. For example, mass of 2 kg.
A unit is an amount or value used to measure something.
Most countries use the metric system with some few exceptions such as the US.
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Nitrogen monoxide gas reacts with hydrogen gas to form ammonia gas and water vapor. True or false?.
Ammonia (NH3) and hydrogen peroxide (H2O2) can react to form Nitrogen (N2), water (H2O), nitric oxide (NO), and some amount hydrogen (H2) and oxygen (O2). Overall, the reactions involved are exothermic. Ammonium is a cation (NH4+), the conjugate weak acid from ammonia (NH3)
i hope this helps!
Find the number of atoms per square centimeter in silicon in the (100), (110), and (111) planes.
The number of atoms per square centimeter in silicon
in the (100) = [tex]6.78[/tex] ×[tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]
in the (110) = [tex]9.59[/tex] ×[tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]
in the (111) = [tex]7.83[/tex] × [tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]
What is silicon?With the symbol Si and atomic number 14, silicon is a chemical element. It is a tetravalent metalloid and semiconductor that is crystalline, rigid, and brittle with a blue-gray metallic sheen. With carbon above it and germanium, tin, lead, and flerovium below it on the periodic table, it belongs to group 14. It rarely reacts, if at all.
Jöns Jakob Berzelius was able to prepare and characterize it for the first time in 1823, but this was delayed due to its high chemical affinity for oxygen. Silicates are a class of anions made up of its oxides. The only metalloid and nonmetal with melting and boiling points higher than its respective values of 1414 °C and 3265 °C is boron.
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HELPPP MEEEE
The compounds, H3PO4, HBr, H2SO4, and HNO3 are classified as which of the following?
Select one:
a. Bases
b. Acids
c. Neutral substances
d. Salts
Acids i think... because I know for sure H3PO4 is a acid and so is Hbr...
Answer:
B. Acids
Explanation:
All of them are acids because H3PO4 is phosphoric acid, HBr is hydrobromic acid, H2SO4 is sulfuric acid, and HNO3 is nitric acid.
Pls. give me a lot of points I took a lot of time to help you. :)
I am the halogen located in the fifth period of the periodic table.Who am I?
A 5. 0 l flask containing o2 at 2. 00 atm is connected to a 3. 0 l flask containing h2 at 4. 00 atm and the gases are allowed to mix. What is the mole fraction of h2? report your answer to two decimal places.
The mole fraction of hydrogen is 0.55.
The volume of oxygen = 5 litres
The pressure of oxygen = 2 atm
The volume of hydrogen = 3 litres
The pressure of hydrogen = 4 atm
The universal gas constant is R.
R = 8.31 J mol—¹ K—¹
The ideal gas equation is,
PV = nR T
The number of moles of oxygen is,
PV = nRT
[tex]n = \frac{ PV }{RT }[/tex]
[tex]n = \frac{2 \times 5}{8.31 \times 273} [/tex]
n = 0.004 moles
The number of moles of oxygen is 0.004 moles.
The number of moles of hydrogen is,
PV = nRT
[tex]n = \frac{ PV }{RT }[/tex]
[tex]n = \frac{4 \times 3}{8.31 \times 273} [/tex]
n = 0.005 moles
The number of moles of hydrogen is 0.005 moles.
The mole fraction of hydrogen is,
[tex]Mole \: fraction = \frac{ Moles \: of \: solute }{Total \: number \: of \: moles \: of \: solute \: and \: solvent}[/tex]
[tex]Mole \: fraction = \frac{0.005}{0.009}[/tex]
= 0.55
Therefore, the mole fraction of hydrogen is 0.55.
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What represents the average kinetic energy of the molecules of any gas? Choose the correct answer.
O pressure
O molar mass
O temperature
O container volume
Answer:
What represents the average kinetic energy of the molecules of any gas? Choose the correct answer.
=Temperature
I HOPE IT HELP YOU
Explain the effect of temperature on oxygen production in the light when the temperature is increased from 40 degrees celsius to 50 degrees celsius
At medium temperatures, between 50 and 68 degrees Fahrenheit, or
10 and 20 degrees Celsius, the photosynthetic enzymes work at their
optimum levels, so photosynthesis rates gauge high.
Explain the effect of temperature on oxygen production :
The photosynthetic enzymes typically operate at their best levels between 50 and 68 degrees Fahrenheit, and any significant departure from this range would slow down photosynthesis.
Despite an increase in the rate of carbon dioxide absorption into leaves at temperatures above 68 degrees Fahrenheit (20 degrees Celsius), the rate of photosynthesis decreases at these temperatures because the enzymes are less effective.
The shape and functionality of the photosynthetic enzymes are lost at temperatures above 104 degrees Fahrenheit (40 degrees Celsius), and the photosynthetic rate rapidly decreases.
Due to the ineffectiveness of the photosynthetic enzymes at low temperatures, specifically between 32 and 50 degrees Fahrenheit (0 and 10 degrees Celsius), the rate of photosynthetic reaction decreases.
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When the temperature is moderate (between 50 and 68 degrees Fahrenheit), the photosynthetic enzymes function at their peak between 10 and 20 degrees and the photosynthesis rates measure at their highest points.
What is the effect of temperature on O2 production?As a result of the cells having to work harder to maintain a greater temperature, the amount of oxygen the cells require to function is also higher.
The temperature has an impact on photosynthesis's rate.
Photosynthesis occurs more quickly at higher temperatures. This is because the majority of chemical reactions are sped up by temperature and photosynthesis is a chemical reaction.
At 25C, oxygen synthesis is greatest. When the temperature is excessively high or low, oxygen generation decreases.
The negative connection between dissolved oxygen and temperature results in lower concentrations of dissolved oxygen.
Reduced dissolved oxygen levels occur as water temperature rises.
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A square piece of paper has an edge measuring 7.06cm (using a centimeter ruler). How many significant figures should appear in the calculated surface area (A=S^2)?
The surface area of a square piece of paper has an edge measuring 7.06cm is 49.84 cm2
What is the surface area?The surface area of an object is the total area of the object that it occupies. It can be measured by adding all the sides of the object.
The surface area of a square is
side x side
Given the sides of the square is 7.06 cm.
This is a square, so all squares have the same size sides. So by putting the values in the equation, we can occupy the surface area of the square.
7.06 x 7.06 = 49.84
Therefore, the surface area of a square piece of paper is 49.84 cm2
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An order calls for a wound irrigation with 100 ml of a mixture of hydrogen peroxide and normal solution at 1:4 ratio. how many ml of peroxide will be used?
20 ml of peroxide will be used if an order calls for a wound irrigation with 100 ml of a mixture of hydrogen peroxide and normal solution at 1:4 ratio.
ExplanationSimple maths
100 ml of a mixture of hydrogen peroxide and normal solution at 1:4
add 1 + 4 gives 5
hydrogen peroxide = 1/5 of the 100ml solution
= 20 ml
What is hydrogen peroxide?Hydrogen peroxide is a mild antimicrobial that can be used straight to the skin for small burns, scrapes, and wounds. Additionally, it can be used as a mouthwash to ease minor mouth irritation (induced, for instance, by canker/cold sores, gingivitis) or to help remove mucus.
This product works by releasing oxygen into the affected region when it is applied. The oxygen is produced, which causes foaming, which aids in cleaning the area by removing dead skin. Animal bites, severe burns, and deep wounds shouldn't be treated with this drug.
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solids analysis is one of the most widely used parameters for assessing water quality. the following tests were performed on a water sample. the sample volume was 150 ml in each test (filtered or evaporated). calculate the parameters requested using the following data. (15 pts)
The total solids is 300 mg/L, volatile solids is 80 mg/L, total suspended solids is 224 mg/L, total dissolved solids is 76 mg/L and the volatile suspended solids is 26.66 mg/L
CalculationThe data we have is
Mass of evaporating dish, Mtare = 24.1520 g
sample volume V = 150 ml
As per the question
a) Total solids = All the solids present whether suspended or dissolved
= [(Mtare+solids - Mtare) x 1000mg x 1000ml ] / V
= [24.1970 - 24.1520] x 10^(6) / 150
= 300 mg/L
b) Volatile solids = portion of solids which are volatized at 550 C
= [(Mtare+solids - Mtare+ash)] x 10^(6) / V
= 24.1970-24.1850 x 10^(6) / 150
= 80 mg/L
c) Total suspended solids = solids that are non-filterable with specified filters and are not volatilized at 105 C
= [Msus solids+ tare +filter - Mtare+filter x 10^(6)] / V
= 1.4939 - 1.4603 x 10^6 / 150
= 224 mg/L
d) Volatile suspended solids = portion of suspended solids which are volatilized at 550C
= Mss+Tare+filter - Mresidue+Tare+filter x 10^(6) / V
= [1.4939 - 1.4899 x 10^(6)] / 150
= 26.66 mg/L
e) Total dissolved solids = solids which are present in solution and filterable
=(Total solids - total suspended solids)
= (300 - 224)
= 76 mg/L
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Why is carbon so useful in molecules for living things? (1 point)
O Carbon is produced in respiration, making it a readily available element.
O Carbon can form the backbone for millions of compounds found in living things.
O Carbon is produced in photosynthesis and carries the energy needed for life.
O Many molecules in living things have millions of carbon atoms in them.
Carbon is very useful in molecules for living things because: Carbon is produced in photosynthesis and carries the energy needed for life.
Photosynthesis is the process of synthesizing one's own food using the inorganic raw materials like sunlight energy, water and carbon dioxide to form food in the form of sugars and releasing oxygen as a by-product. The food synthesized by photosynthesis of an organic carbon compound which is then transferred to further species of the food chain.
Energy is the most essential requirement for living organism's to perform all the life processes inside the body. This energy is derived by the ingested food which is formed of carbon atom. This demonstrates the usefulness of carbon for living things.
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What can models show us specifically about the makeup of substances on the atomic level?
Models can show us specifically how atoms of a substance are arranged and connected on the atomic level.
What are atomic models?Atomic models is defined as a graphic representation of the structure of an atom which shows that it contains a nucleus made up of proton and neutrons and has an electron revolving round around it.
The first scientist that proposed the description of the inner structures of an atom is William Thomson in 1900.
Other scientist that carries out works on the atomic structure to produce a model include the following:
John DaltonJ.J. ThomsonErnest RutherfordNiels BohrErwin Schrödinger.Therefore, Models are important in makeup of substances on the atomic level because it can show us specifically how atoms of a substance are arranged and connected on the atomic level.
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At 1 atmosphere and 20 degrees Celsius, all are samples of H2O must have the same a) mass b) density c) volume d) weight
i know the answer is density but someone please explain why, a good explain room please and I’ll mark brainliest!!
At 1 atmosphere and 20 degrees Celsius, all samples of H₂0(l) must have the same density.
The correct option is B.
What does atmosphere mean?The atmosphere of a globe or other celestial body refers to the layers of gases that surround it. Nitrogen makes up around 78% of the chemicals in the Earth's atmosphere, followed by oxygen at 21% and other gases at 1%.
Why is the atmosphere important?It not only shields us from harmful UV solar radiation but also gives us the oxygen we need to survive. Without it, our planet could not sustain the pressure required for liquid water to exist on its surface. It also maintains the planet's temperature and the conditions necessary for life to exist.
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1/ d. f blocks -... Consider the following elements C.Na, Mg, P, S. 17CL N Which of these can: a. Form hydrides by electrovalent binding b. Be used to catalyse a chemical reaction c. Be used in radioactive dating d. Form and acid anhydride e. Exhibit both metallic and non-metallic behavior
a)Elements that form hydrides by electrovalent binding are Sodium(Na), and Magnesium (Mg).
b)None of the elements is used to catalyze a chemical reaction and the elements that catalyze the reaction are platinum, cobalt, and iron.
c)Elements used in are radioactive dating [tex]C^{14}[/tex]
d)The element which forms acid anhydride is phosphorous (P).
e)The element that exhibits both metallic and non-metallic behavior is Metalloids.
The tabular display of chemical elements is the periodic table, Which contains 18 periods and 7 groups.
All the elements are configurable in the S, P, D, and F blocks.
S and D block elements mostly contain metals, and P- block contains non-metals and Metalloids.
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Magnesium (mg) has an hcp crystal structure, a c/a ratio of 1. 624, and a density of 1. 74 g/cm3. Compute the atomic radius for mg. Bryant
The atomic radius of Magnesium (mg) that has an hcp crystal structure, a c/a ratio of 1. 624, and a density of 1. 74 g/cm3 is1.6×〖10〗^(-8) cm.
The number of atoms that are present in each unit cell of a specific hexagonally closed-packed crystal with six atoms is known as hexagonal closed packing, or HPC. It is written as
ρ=(n×A)/(V_c×N_A )
Where
ρ is the density
n is the number of atoms
N_A is Avogadro’s constant (6.023×〖10〗^23 atoms/mol)
A is the molar mass of magnesium (24,305g/mol)
V_c is the volume of the crystal
V_c can be calculated using the expression below
V_c=(a^2 c×3√3)/2
a is the short crystal dimension (2R)
c is the long crystal dimension
1.624=c/a
c=1.624a
Putting the values in the above equation
V_c=(a^2×1.624a×3√3)/2
V_c=((2R)^2×1.624(2R)×3√3)/2
V_c=(4R^2×3.248R×3(1.73))/2
V_c=(67.428R^3)/2
V_c=33.71R^3 〖cm〗^3/(unit cell)
Substituting values into the density equation
ρ=(n×A)/(V_c×N_A )
1.74=(6×24.305)/(33.71R^3×6.023×〖10〗^23 )
Making R the subject of formula
R^3=145.83/(1.74×33.71×6.023×〖10〗^23 )
R^3=145.83/(3.53×〖10〗^25 )
R^3=4.127×〖10〗^(-24)
R=∛(4.127×〖10〗^(-24) )
R=1.6×〖10〗^(-8) cm
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An atom of an element has 15 protons and 16 neutrons. What is its proton number?
What is its nucleon number?
Answer: 3
Nucleon number is 31
Explanation:
The components of substances that are ______ separate when the substance is placed in water.
The components of substances that are ionically bonded separate when the substance is placed in water.
Water is an excellent solvent due to its polarity and its ability to for the hydrogen bonds. Because of this property, different substances dissolves and get separated in the water which are ionically bonded.
Ionically bonded compounds separates in the water because the molecules of water hydrate the ions. To separate an ionically bonded compound, the water molecules should be able to stabilize the ions. This stability results from breaking the ionic bonds. They do this by hydrating the ions.
Water is a polar molecule and has a permanent dipole moment. The oxygen atom has a partial negative charge and the hydrogen atoms have a partial positive charge. The water molecules attracts the positive and negative ions, when an ionic substance is placed in water.
The positive ions have several water molecules around them, and oxygen atoms are close to the positive ion. The negative ions have several water molecules around them, and hydrogen atoms are close to the negative ion.
The water molecules reduces attractions between the ions resulting in the weakening of ionic bond which results in the hydration of ions.
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what type of properties can be used to separate mixtures?
Explanation:
physical separation technique are based on physical properties of the substance
Answer:
Physical properties
Explanation:
Mixtures can be physically separated by using methods that use differences PHYSICAL PROPERTIES(boiling point, melting point, solubility in a given solvent,etc) to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
Elements in the same group share many chemical and physical properties, such as:
a
Conductivity
b
Malleability
c
Reactivity
d
All of the above
Elements in the same group share many chemical and physical properties, such as the follows:
ConductivityMalleabilityReactivityWhat are the features of elements in the same group?Elements are the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
Elements are arranged in order of their atomic number on the periodic table. The periodic table is arranged in groups (vertical columns) and periods (horizontal rows).
Elements in the same group possess the same chemical properties, which include;
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Thanks in advance for you help
Answer:
Option 3
Explanation:
Because electrons have the same charge, they repel. So, if possible, the electrons should be in different orbitals.
Correct option is 3 for the arrangement for a 2p sublevel with only 3 electrons.
Atomic orbitals unite to generate an equal number of hybrid orbitals during the formation of certain compounds, a process known as orbital hybridization. In terms of both atomic theory and quantum physics, an atomic orbital is a function that explains the location and wave-like activity of an electron in an atom.
The probability of finding an electron in any atom in any region around the nucleus may be calculated using this function. A mathematical function known as a molecular orbital can be used to describe the location and wave-like activity of an electron inside a molecule.
This function may be used to determine chemical and physical attributes such as the probability of finding an electron in a specific region. In addition to being entirely destroyed, orbital bombardment also does damage to any army.
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draw the structure of the two tertiary (3°) alcohols with the molecular formula c6h14o that contain only one ch3 group attached to the main carbon chain.
Convert the density of a red solution (1.31 g/ml) to pounds/ inch3 . recall that 1 ml = 1 cm3 , 2.205 pounds = 1 kg, 2.54 cm = 1 inch, 1 liter = 1.056 quarts.
The conversion of density of a red solution is 1.31 g/ml to [tex]pound/inch^{3}[/tex] is 0.0473 [tex]pound/inch^{3}[/tex].
The density of red solution = 1.31 g/ml = 0.00131 kg / [tex]cm^{3}[/tex]
1ml = 1[tex]cm^{3}[/tex]
2.205 pounds = 1kg
so, 0.00131 kg / cm3 = 0.00131 × 2.205 pounds / cm3
2.54 cm = 1 inch
1 l = 1.056 quarts.
now, from the above values,
1.31 g/ml = ( 0.00131 × 2.205) pounds /[tex]cm^{3}[/tex] × (2.54 cm / inch )3
= 0.0473 pound / [tex]cm^{3}[/tex]
thus, we get the required conversion from g/ml to pounds / inch3.
Therefore,The conversion of density of a red solution is 1.31 g/ml to [tex]pound/inch^{3}[/tex] is 0.0473 [tex]pound/inch^{3}[/tex].
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