Mass of iron sulfide obtained : 22 g
Further explanationReaction
Fe+S⇒FeS
8 grams of sulfur and 28 grams of iron are taken for the reaction
Find limiting reactantmol of Fe(Ar=56 g/mol) :
[tex]\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{28}{56}\\\\mol=0.5[/tex]
mol of S(Ar=32 g/mol) :
[tex]\tt mol=\dfrac{8}{32}=0.25[/tex]
Limiting reactant ⇒ S(smaller mol ratio), excess reactant : Fe
mol of FeS based on limiting (S) ⇒0.25(mol ratio from equation = 1 : 1)
Mass FeS(MW=88 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=0.25\times 88\\\\mass=22~g[/tex]
A container at STP contains 64.0O grams of oxygen. How many liters of O2(g) are in the container?
Answer:
44.80
Explanation:
What does the theory of continental drift state?
A
All the continents were once one continent that broke up and drifted apart over hundreds of millions of years.
B
The continents have always been separate but may one day drift together to form a single continent.
C
The layout of the continents is the same today as it has always been.
D
New continents are continually being created and destroyed.
The table below shows the number of sub-atomic particles in an atom of boron.
What is the amu of a boron atom?
a. 5
b. 6
c. 10
d. 11
op. c 10 is ur ans
HOPE THIS HELPS!!
Answer:
11 amu=Protons+Nuetrons the actual amu in the period table is 10.8
Explanation:
amu is Protons + nuetrons (5+6) = 11
This can be crossed checked with a periodic table where it has a amu of 10.8 which can be rounded up to 11.
4.45 kcal of heat was added to increase the temperature of a sample of water from 23.0 °C to 57.8 °C. Calculate
the grams of water. Specific heat of water is 1 cal/g. °C. lkcal = 1000cal
Answer:
m = 4450 g
Explanation:
Given data:
Amount of heat added = 4.45 Kcal ( 4.45 kcal ×1000 cal/ 1kcal = 4450 cal)
Initial temperature = 23.0°C
Final temperature = 57.8°C
Specific heat capacity of water = 1 cal/g.°C
Mass of water in gram = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 57.8°C - 23.0°C
ΔT = 34.8°C
4450 cal = m × 1 cal/g.°C × 34.8°C
m = 4450 cal / 1 cal/g
m = 4450 g
10) What is the volume ratio of hydrogen to oxygen in water production?
Answer:
2:1
Explanation:
Water molecules feature the combinations of hydrogen and oxygen atoms in a 2:1 ratio.
An ionic bond results due to the __________________________ attraction between two oppositely charged ion.
Answer:
Electrostatic
Explanation:
An ionic bond results from the electrostatic attraction between oppositely charged ion.
Usually, metallic ion is positively charge and the non-metallic ion is negatively charged.
The attraction results in the formation of an ionic bond. Ionic bond forms by the transfer of electrons from a metal to a non - metal. The charge separation causes the oppositely charged atoms to be attracted to one another.Five liters of air at -36 c is warmed to 89c. what is the new volume if the pressure remains constant?
Answer:
Explanation:
The altitude is irrelevant, except as needed to define the pressure. In this example all three parameters of the Ideal Gas Laws are changing. We set up the equation to solve for the desired final volume. Start with the Ideal Gas Law:
P
⋅
V
=
(
n
⋅
R
⋅
T
)
where the number of moles of gas and the gas constant do not change.
(
P
V
T
)
1
=
(
P
V
T
)
2
Rearrange for the desired
V
2
, Temperatures must be in ‘K: 298 & 283.
(
P
1
V
1
T
1
)
×
T
2
P
2
=
V
2
V
2
=
P
1
×
V
1
×
T
2
T
1
×
P
2
V
2
=
730
×
855
×
283
298
×
605
=
980
L
“Change” in volume is
980
–
855
=
125
L
A. Iodine
B. Gold
C. Magnesium
D. Potassium
Answer:
A, Iodine
Explanation:
It exists, sodiumiodine.
Which statement describes how the binary ionic compound KBr is named?
Which statement describes how the binary ionic compound KBr is named? The metal is named first, and the name is unchanged. Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?
B. The metal is named first and the name is unchanged.
How much heat is required to take a 150 g sample of water from 10.0 ℃ to 95.0 ℃? cs,water = 4.184 J/g*℃
Answer:
[tex]\boxed {\boxed {\sf 53, 346 \ Joules}}[/tex]
Explanation:
We are given the specific heat and change in temperature, so we should use this heat formula:
[tex]q=m C \Delta T[/tex]
where m is the mass, C is the specific heat capacity, and ΔT is the change in temperature.
We know the mass is 150 grams. The specific heat of water is 4.184 J/g °C.
Let's find the change in temperature.
Subtract the initial temperature from the final temperature.
ΔT= final temp - initial tempfinal= 95.0 °C and initial= 10.0 °CΔT= 95.0 °C - 10.0 °C= 85.0 °CNow we know all the values:
[tex]m= 150 \ g \\C= 4.184 J/ g \ \textdegree C \\\Delta T= 85.0 \textdegree C[/tex]
Substitute them into the formula.
[tex]q=(150 \ g) (4.184 \ J/g \ \textdegree C)(85.0 \textdegree C )[/tex]
Multiply all three numbers together. Note that the grams (g) and degrees Celsius (°C) will cancel out. Joules (J) will be the only remaining unit.
[tex]q=(627.6 \ J/ \textdegree C) ( 85.0 \textdegree C)[/tex]
[tex]q=53346 \ J[/tex]
53,346 Joules of heat are required.
If a truck's tires are filled to a pressure of 2.38 atm when they are 25.0
degrees Celsius, what would their pressure be, if the temperature of the
tire goes up to 52.78 degrees Celsius after driving on the highway.
Answer:
P₂ = 2.60 atm
Explanation:
Given data:
Initial pressure = 2.38 atm
Initial temperature = 25.0 °C
Final pressure = ?
Final temperature = 52.78°C
Solution:
Initial temperature = 25.0 °C (25.0+273 = 298 K)
Final temperature = 52.78°C (52.78+273 = 325.78 K)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
2.38 atm / 298 K = P₂/325.78 K
P₂ = 2.38 atm × 325.78 K / 298 K
P₂ = 775.35 atm. K /293 K
P₂ = 2.60 atm
Can anyone help me with my homework
The soil is still radioactively contaminated after the Chernobyl nuclear explosion. so NO, Most of the people who left Chernobyl after the nuclear plant explosion have not returned. NO, The accident at Chernobyl had not occurred during a safety test.. YES, Temperatures inside the reactor during the explosion were as hot as parts of the Sun's atmosphere. YES, The fuel in the reactor included U-238 from enriched uranium dioxide.
YES, A radioactive cloud blew across Northern Europe after the explosion. NO,Isotopes of the same element have not the same number of neutrons. but Isotopes are atoms of the same element that have the same number of protons and electrons but different numbers of neutrons YES, When one mole of U-235 undergoes fission, the energy released can power about 400 average U.S. homes for a year.
YES, Nuclear reactors must have control rods to keep a chain reaction from occurring.
YES, Radioactive strontium can lead to bone cancer.
YES, The radioactive iodine released during the explosion still poses a health threat to people in Northern Europe.
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Which of the following is true for an element that is oxidized during a redox reaction?
Group of answer choices
It gains electrons.
It gains protons.
It loses protons.
It loses electrons.
Answer:
It loses electrons.
Explanation:
When an atom is oxidized in a redox reaction, it simply loses electrons and the oxidation number increases.
An oxidized atom implies that oxidation has occurred; oxidation can be defined as:
addition of oxygen to a specieremoval of hydrogen from a specie loss of electron by an atomincrease in the oxidation number of an atomincrease in the number of electronegative atoms surrounding an element in changing from reactants to products.D. It loses electrons
Here's how it works!
Oxidation occurs when an atom, molecule, or ion loses one or more electrons. In the process of oxidation, the oxidation state of the chemical species increases. Originally, the term was used to describe when oxygen caused electron loss in reactions. I hope that helps you!
what element have 3 PELS?
Answer:
boron aluminum gallium indium
Explanation:
hope this helps you
does anyone know how to do this???
Answer:
2.9 g/cm³
Explanation:
From the question given above, the following data were obtained:
Mass = 236.376 g
Volume = 81.5 cm³
Density =?
Density can be defined as the mass of a substance per unit volume of the substance. It can be expressed mathematically as:
Density = mass /volume
With the above formula, we can obtain the density of the object as shown below:
Mass = 236.376 g
Volume = 81.5 cm³
Density =?
Density = mass /volume
Density = 236.376 / 81.5
Density = 2.9 g/cm³
Thus, the density of the object is 2.9 g/cm³
What causes mountains to form
A) two oceanic plates spreading at a divergent boundary
B) two oceanic plates colliding at a convergent boundary
C) two continental plates spreading at a divergent boundary
D) two continental plates colliding at a convergent boundary
Answer
The Correct Answer Is D
How do electrons in the same orbital move?
PLS HELP PLS HELP PLS
Answer: liver and pancreas
Explanation:the pancreas makes insulin and the liver makes liquid to break down the food
Answer:
3) pancreas and liver.........
Help! What is the the correct number for the product of this particular reaction?
Answer: synthesis, decomposition, single-displacement, double-displacement, combustion and acid-base reactions.
Explanation:
3. Will a paper airplane with longer wings fly farther than shorter wings?
Independent variable
Yes, the more air that can get under the wings the longer the airplane will stay airborne increasing the chances it will fly farther.
What is an independent variable ?It is an independent variable that doesn't alter as a result of the other variables you're attempting to assess. An independent variable could be something like a person's age. Other aspects of a person's life, like as what they eat, how much they attend school, or how much television they watch, won't alter their age.
Design of the paper aircraft would be your independent variable, and flight distance would be your dependent variable. Your constants would be things like where you are when you fly the planes, who is flying them, how they launch, the kind of paper used to build them, etc.The plane was tested to see how far it would fly as each paper clip was added. The manipulated variable was the mass of the plane (the quantity of paper clips added). The flying distance was the responding variable. The experiment's controlled variable was the usage of the same plane in each trial.Learn more about Independent variable here:
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[xe] 6s2 4f4 is the noble gas configuration for which element
Answer:
Neodymium
Explanation:
The given element is:
[Xe] 6s² 4f⁴
To solve this problem, we need to find the number of electrons in the element given;
Xe has 54 electrons already
6s² 4f⁴ where:
letters are the orbitals
6 and 4 are the energy levels
superscript are the number of electrons
So, 2 + 4 = 6
Total number of electrons = 54 + 6 = 60
The element is Neodymium
[xe] [tex]6s^2[/tex] [tex]4f^4[/tex] is the noble gas configuration for Neodymium. The electron configuration of noble gases follows the general law of electrons filling into atoms' energy levels and orbitals.
The term "noble gas configuration" refers to the periodic table's Group 18 (Group 8A) noble gases' electron configuration. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) are some of these gases. The general rule of filling electrons into atoms' energy levels and orbitals applies to the electron configuration of noble gases. Noble gases are extremely stable and inert because their electron shells are totally filled. The electron configuration of atoms that come after noble gases is frequently expressed using the noble gas configuration as a shortcut notation.
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A combination of any elements bonded together
Answer:
are called Compounds
Answer:
Compouds
think of a group
an they are alll combined
also "compounds" com-bind = com-POUNDS
Make's sense now?
How many total molecules will be present when the reaction of 5,000 molecules of CS2 with 15,000 molecules of 0 2 goes to completion?
CS2(1)+3 02(g) CO2(g) + 2S02(g)
(A) 5,000
(B) 10,000
(C) 15,000
(D) 20,000
Answer:
(C) 15,000
Explanation:
The equation is ...
CS₂ +3O₂ ⇒ CO₂ +2SO₂
This indicates 1 molecule of CS₂ combines with 3 molecules of O₂ to produce 1 molecule of CO₂ and 2 molecules of SO₂.
Counting molecules, we see that the original 4 molecules in a 1:3 ratio become 1+2 = 3 molecules. The reactants present are in the necessary 1:3 ratio of CS₂ : O₂, so there are no limitations on the reaction. It can use all of the original molecules to produce ...
(3/4)(20,000) = 15,000
molecules of product.
When the reaction completes, there will be 15,000 molecules present.
Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion, HSO4-.
Explanation:
conjugate acid/base pairs are compounds which differ by the hydrogen ion (H⁺)
The conjugate based is formed when an acid donates a proton.
HSO₄⁻ --> H⁺ + SO₄²⁻
The conjugate base of HSO₄⁻ is SO₄²⁻
The conjugate acid is formed when a base accepts a proton.
HSO₄⁻ + H⁺ --> H₂SO₄
The conjugate acid of HSO₄⁻ is H₂SO₄
The mass of 3.02 x 10^22 molecules of water is ___.
Answer:
0.9 g (approximately)
Explanation:
- In each of the following sets of elements, which
element shows the least ability to gain or lose
electrons?
a. Cs, Rb, Na
b. Ba, Ca, Be
c. F, Cl, Br
d. O, Te, S
Answer:
a. Cs, Rb, Na
Explanation:
Electronegativity is the ability of an element to lose or gain electrons. It is expressed as a number that measures the relative tendency with which atoms of the element attract valence electrons in a chemical bond.
Across the periodic table, electronegativity increases except for the noble gasesIt decreases down the groupGroup 1 elements have the least electronegativityCs, Rb and Na all belongs to this groupThey are called the alkali metalsThey are the most electropositive group on the periodic table.How many liters of a 3 M NaOH stock solution would you need to make 552 mL of a 105 mM NaOH dilution
Answer:
0.01932 L
Explanation:
First we convert 105 mM to M:
105 mM / 1000 = 0.105 MNext we convert 552 mL to L:
552 mL / 1000 = 0.552 LThen we use the following equation:
C₁V₁=C₂V₂Where:
C₁ = 3 MV₁ = ?C₂ = 0.105 MV₂ = 0.552 LWe input the given data:
3 M * V₁ = 0.105 M * 0.552 LAnd solve for V₁:
V₁ = 0.01932 L What isotope has 12 protons, 13 neutrons and 12 electrons?
Answer: Magnesium
Magnesium, in its elemental form, has 12 protons and 12 electrons. The neutrons are a different matter. Magesium's average atomic mass is 24.305 atomic mass units, but no magnesium atom has exactly this mass.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!!!! :D
is yeast living or non living?
Answer:
Yeast is living.
Explanation:
Yeast is a type of fungus used in making bread. Fungus is a group of living organisms.
What is the distance from and object’s top to its bottom?
The distance from object’s top to its bottom is Height
The distance from object’s side to side is Length