A rectangular block has dimensions 2.9 cm ✕ 2.0 cm ✕ 10.0 cm. The mass of the block is 695.0 g.

The mass (in grams) of H₂O produced from the reaction is 2520 grams

We'll begin by writing the balance equation for the reaction. This is given below:

CH₄(g) + 2O₂(g) -------> CO₂(g) + 2H₂O(g)

From the balanced equation above,

1 mole of CH₄ reacted to produce 2 moles of H₂O

Therefore,

70 moles of CH₄ will react to produce = 70 × 2 = 140 moles of H₂O

Finally, we shall determine the mass of water, H₂O produced from the reaction as follow:

Mole = mass / molar mass

Cross multiply

Mass = mole × molar mass

Mass of water, H₂O = 140 × 18

Mass of water, H₂O = 2520 grams

Thus, 2520 grams of water, H₂O were obtained from the reaction

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Answer:

07 Question (2 points) See page 160 The concentration of phosphate ions in water samples can be determined by spectrophotometry. Samples are treated with tin(II) chloride and ammonium molybdate to react with the phosphate to make a blue complex. Before testing an unknown sample, a series of solutions with known concentrations is tested to create a calibration plot. Calibration data with concentration units of part per million (ppm) are shown in the graph below. Calibration Data for Phosphate Analysis D Absorbance 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 04 Rat B 0.0434 -0.0264 R = 0.9945 A A water sample of unknown phosphate concentration is found to have an absorbance of 0.460 after treatment with tin(II) chloride and ammonium molybdate. What is the concentration of phosphate ion in the sample? ppm

The amount of volume in millilitres a 6.1 M HCI solution needed to obtain 0.150 mol HCI is 24.6mL.

The volume of a solution can be calculated by dividing the number of moles by the molarity of the solution as follows:

Volume = no of moles ÷ molarity

The molarity of a solution is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

According to this question, 6.1 M HCI solutions are needed to obtain 0.150 mol HCI, the volume required can be calculated as follows:

Volume = 0.150moles ÷ 6.1 M

Volume = 0.0246 L

To convert this volume to millilitres, we multiply by 1000 to derive 24.6mL.

Therefore, the amount of volume in millilitres a 6.1 M HCI solution needed to obtain 0.150 mol HCI is 24.6mL.

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Answer:

Lithium has more electrons than Hydrogen

Explanation:

Lithium has 2,1 electrons
Hydrogen has 1 electrons

An atom with 15 protons and 16 neutrons is an atom of phosphorus, P. A neutral phosphorus atom has 15 electrons which is equal to number of proton.

A mineral called phosphorus is found in many foods naturally and can also be taken as a supplement. It has numbers of function in the body. It is a crucial component of cell membranes, bones, and teeth. It maintains a normal range of blood pH and aids in the activation of enzymes.

All tissues and cells require phosphorus for their growth, upkeep, and repair, as well as for the synthesis of DNA and RNA, the genetic building blocks. Additionally, other vitamins and minerals like vitamin D, iodine, magnesium, and zinc need phosphorus to be balanced and used.

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1 mole of LiF has 2 moles of ions. Therefore, the given statement is true.

1 mole of LiF (s) contains 1 mole of [tex]Li^+[/tex] ion and 1 mole of [tex]F^-[/tex] ion.

So, total 2 moles of ions are present.

One fluorine (F) atom and one lithium (Li) atom can interact to produce the chemical compound Lithium Fluoride, or LiF.

LiF is an inorganic substance. It is a colorless solid that becomes white as the size of the crystals decreases. Lithium fluoride doesn't have an odor, but it tastes salty and unpleasant. Although it has a structure similar to sodium chloride, it is substantially less soluble in water. This is mostly due to LiF's stronger ionic nature. The ratio of lattice energy to hydration energy determines a compound's solubility in water.

Thus, the statement is true.

The complete question is:

A mole of LiF(s) contains 2 moles of ions. State whether the statement is true or false.

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SO3 gas has the highest density.

A modified version of the ideal gas law is used to calculate density, replacing moles and volume with density and molar mass.

The relationship between a gas's density and molecular weight can be demonstrated using the ideal gas law equation. The formula is d = MP/RT, where d is the gas's density in kilograms per liter, M is its molar mass in grams per mole, P is its pressure in atmospheric pressure units, and R is the gas law constant. The equation demonstrates that the molar mass increases as gas density increases.

d = PM/RT

d ∝ M

CO = 28

CO2 = 44

SO3 = 80

Cl2 = 71

Thus SO3 will be more dense.

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The equilibrium constant expression for the given reaction is:-

Equilibrium constant = [NH₃] [H⁺] / [NH₄⁺]

An equilibrium constant is the ratio of the concentration of products to the concentration of the reactant raised to the power of its coefficients.

The rate constants are constant at some particular temperature. It is equal to the rate constant for the forward reaction divided by the rate constant for the backward reaction.

aA + bB ⇄ cC + dD

The equilibrium constant for the reaction is given as

NH₄⁺ (aq) → NH₃ (aq) + H⁺ (aq)

The expression is given as

Equilibrium constant = [NH₃] [H⁺] / [NH₄⁺]

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Among the following option c "2g of Mg" is correct answer. 2g of Mg contains one mole of neutrons.

What is neutron?

The neutron is a neutral subatomic particle that, with the exception of common hydrogen, is a component of every atomic nucleus. Its rest mass is 1.67492749804 1027 kg, which is slightly more than that of the proton but 1,838.68 times higher than that of the electron. It has no electric charge.

Since you are taking the mass of magnesium (2 g) and dividing by the molecular mass of magnesium (24 g/mol), the formula

[tex]amount of substance=\frac{mass}{molar mass}[/tex]

informs you that you have 1/12 moles of magnesium. The quantity of magnesium in the question is not, however, being asked.

Each magnesium atom contains 12 neutrons (24 - 12). As a result, 1/12 moles of magnesium contain 1 mole of neutrons (1/12)(12).

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The percentage error of the recorded temperature is 2.9%

Percentage error = (absolute error / actual measurement) × 100

The following data were obtaned from the question:

The percentage error of the recorded temperature can be obtained as follow:

Percentage error = (absolute error / actual measurement) × 100

Percentage error = (1 / 34) × 100

Percentage error = 2.9%

Thus, the perecentage error of the recorded temperature is 2.9%

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Craters are produced when asteroids, meteoroids, or comets hit the moon's surface.

This refers to a type of depression which is formed on the surface of the planet, moon etc which are present in the solar system due to hyper velocity impact of a smaller body such as asteroids, meteoroids etc.

Craters can also be formed as a result of the explosion which results from the impact of the smaller bodies mentioned above. The moon has a lot of craters which was formed billions of years ago and is therefore the most appropriate choice in this scenario.

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The value of the following expression is 0.0429 rounded off to 0.043. The correct number of significant figures is 2.

The given expression (6.5 - 6.35) / 3.49  is calculated as below

(6.5 - 6.35) / 3.49

0.15 / 3.49

0.04297

0.043

Zeros to the left of the first non-zero digit are considered as not significant. For example 0.00765 has only 3 significant numbers.

When multiplying and dividing measured quantities, the output of the calculation should have the same number of significant figures as the measured quantity with the fewest significant figures. When performing multiple stage calculations, do not round intermediate stage calculation results; keep as many digits as is practical and round off only in the final output

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The "di" prefix in the common name comes from the removal of two protons from phosphoric acid, [tex]H_3PO_4[/tex], during the formation of the [tex]HPO_4^2^-[/tex]anion. Calcium mono-hydrogen phosphate is another name for dibasic calcium phosphate.

An ion is basically an electrically charged atom or molecule. By convention, the charge of an electron is considered to be negative, and this charge is equal to and opposite to the charge of a proton, which is considered to be positive.

The common name's "di" prefix originates from the expulsion of two protons from phosphoric acid, [tex]H_3PO_4[/tex], even during establishment of the [tex]HPO_4^2^-[/tex] anion.

Thus, it can be concluded that the ions in the calcium hydrogen phosphate are calcium ion and hydrogen phosphate ion.

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Answer:

3.90 Square Inch = 25.16124 Square Centimeter

Explanation:

How to convert Square Inch to Square Centimeter ? 1 square inch (in²) is equal to 6.4516 square centimeter (cm²).

A substance containing only one type of atom is called a chemical element. This differs slightly from an element, which is a category of atoms based on their number of protons. A chemical element is a substance that exists in the real world and is formed from only one type of atom.

This substance can be a set of atoms present on their very own or the atoms can be bonded together to shape molecules of the simplest type of atom, together with oxygen. while a substance incorporates only one form of an atom, it is known as a detail. each detail has a unique name and specific houses which are one of a kind from all of the relaxation of the elements.

An atom is a particle of count that uniquely defines a chemical detail. An atom consists of a principal nucleus which is surrounded by using one or extra negatively charged electrons. The nucleus is definitely charged and consists of one or more fairly heavy particles known as protons and neutrons. isotopes are members of a family of detail that all have the same wide variety of protons but unique numbers of neutrons.

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87.5 ml of Tween 20 is needed to prepare a 350 mL of a 25% Tween 20 (also called polysorbate 20) (v/v) solution in water via chemical lab methods.

By ethoxylating of Sorbian monolaurate in labs or in factories, a compound is formed that is a is a nonionic surfactant of the polysorbate type and is named as Polysorbate 20 or as we commonly call it as Tween 20.

Its other common commercial brand names can be stated as Kolliphor PS 20, Scattics, Alkest TW 20, Tween 20, and Kotilen-20 etc.

It can be employed as a detergent and emulsifier in a variety of home, academic, and pharmaceutical applications due to its stability and relative nontoxicity.

This Tween 20 is also used as a wetting agent in a wide range of flavored mouth drops and thus provides a spreading effect to the other ingredients present in it.

To prepare 350ml 25% Tween 20 v/v solution

25% is the volume of Tween 20 in the entire solution

Thus volume = 25% of 350

= 350 x (25/100)

= 87.5 ml

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Answer:

facts yo

Explanation

Answer:

Hydrogen(H) is in fact explosive. So H and Oxygen have a strong bond which means when they have some sort of contact it will cause a reaction. H consists of one proton and one electron which means that this simple structure can cause a chemical reaction that could cause something to be flammable and easy to ignite, it happens when H comes in contact with the oxygen in the air it can cause some sort of explosion or something relatively similar.  I hope this makes sense.

Explanation:

Hope this helps:).........if not then sorry for wasting your time and may God bless you<3

A reaction which is carried out in a bomb calorimeter with Ccal = 5.01 kJ/°C, gives off 318 kJ of heat. The final temperature of the water in the calorimeter is 88.27°C

Now,

 according to the given question,

 The given data is :

    Ccal = 5.01 kJ/°C

   Heat (q) = 318 kJ

   Initial temperature = 24.8°C

   Final temperature = ?

Now we know that equation of bomb Calorimeter is given by;

q = cΔT

Hence,  

 318kJ =  5.01 kJ/°C ( T(final) - 24.8°C )

 T(final) = 88.27°C

Thus, from the above conclusion we can say that a reaction which is carried out in a bomb calorimeter with Ccal = 5.01 kJ/°C, gives off 318 kJ of heat. The final temperature of the water in the calorimeter is 88.27°C.

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Answer:

physical

Explanation:

theres nothing really going on w the paper clip ur just bending it

The climate of a region is influenced by large bodies of water like oceans, seas, and major lakes. As a result, coastal regions will have different summer and winter temperatures.

The weather in Tahoe is dry and moderate. There is relatively little humidity even in the summer, and snowstorms in the winter are when most precipitation occurs. The lake lies 1,890 meters above sea level at an elevation of 6,200 feet, although the nearby mountain peaks are between 9,000 and 10,000 feet higher (2,743 to 3,048 meters.)

In Nevada, Lake Tahoe is used as a reservoir for municipal and irrigation water storage. About 75% of the water supply for the quickly expanding Reno-Sparks region comes from Lake Tahoe and a few smaller publicly and privately owned reservoirs in the Truckee River system.

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The pressure within Earth's atmosphere is referred to as atmospheric pressure or barometric pressure. The definition of the standard atmosphere is 101,325 Pa, or the same as 1013.25 millibars, 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.

If the air pressure at sea level is 1,014 mbar, what would you expect would happen to the air pressure in a hole that is dug 1,000 feet below ground?

"451.5415 psi"

14.7 psi + 1000*(0.445 psi) = 451.5415 psi

As we descend in the atmosphere, there is a greater mass of atmosphere above us, hence it is predicted that the pressure will rise.

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The percentage error of the recorded temperature is 2.9%

Percentage error = (absolute error / actual measurement) × 100

The following data were obtaned from the question:

The percentage error of the recorded temperature can be obtained as follow:

Percentage error = (absolute error / actual measurement) × 100

Percentage error = (1 / 34) × 100

Percentage error = 2.9%

Thus, the perecentage error of the recorded temperature is 2.9%

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The final concentration of the solution is 2.75 * 10^-3 M.

We know that the stock solution is the solution from which we are able to prepare other solutions. The concertation of the stock solution is always seen to be higher than the concentrations of the other solutions that are obtained from it.

Given the dilution formula;

C1V1 = C2V2

C1 = initial concentration

C2 - final concentration

V1 - initial volume

V2 - final volume

Thus we have;

4.68 x 10^-3 M * 250 mL = C2 * 425 mL

C2 =  4.68 x 10^-3 M * 250 mL/425 mL

C2 = 2.75 * 10^-3 M

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Missing parts;

A cough syrup contains red dye #40, with a concentration of 4.68 x 10-3 M.a.If you dilute the cough syrup by adding 175 mL of water to a 250. mL sample of the cough syrup, what will be the final concentration?

Answer:

The kinetic energy is,

Explanation :

The formula for kinetic energy is:

where,

R = gas constant = 8.314 J/mol.K

T = temperature =

Now put all the given values in the above kinetic energy formula, we get:

Therefore, the kinetic energy is,

Explanation:

Answer:

1.285 x 10²³ molecules CH₄

Explanation:

To find the amount of molecules in the sample, you need to (1) convert grams to moles (using the molar mass of CH₄) and then (2) convert moles to molecules (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 4 sig figs like the given value (3.423 = 4 sig figs).

Atomic Mass (C): 12.011 g/mol

Atomic Mass (H): 1.008 g/mol

Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)

Molar Mass (CH₄): 16.043 g/mol

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

 3.423 g CH₄               1 mole                  6.022 x 10²³ molecules
-----------------------  x  -------------------  x  -------------------------------------------  =
                                   16.043 g                            1 mole

=  1.285 x 10²³ molecules CH₄

Answer:

He

Explanation:

Helium is a gas, not a metal.

[tex] \huge \mathbb{\pink{\fbox{\blue{\underline{\green{ANSWER}}}}}} \\ \\ \tt (a) \: 1.37 \times 10 {}^{ 0} [/tex]

The mass in milligrams of the drug present in 1 L of plasma is 5 * 10⁻⁵ mg

Plasma is the liquid part of blood which contains dissolved solutes such as ions, proteins and sugar.

Plasma concentration of fluid are important in general health, diagnosis and  treatment of diseases.

The plasma level of the drug was found to be 5ng/dL.

I dl = 1/10 L

1 dL = 0.1 L

1 ng =  1 * 10⁻⁶ mg

5 ng = 5 * 10⁻⁶ mg

The milligrams of drug are present in 1 L of plasma = 5 * 10⁻⁶ mg/0/ L

The milligrams of drug are present in 1 L of plasma = 5 * 10⁻⁵ mg

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