Quiz about Chemistry-The Mole and Stoichiometry

Question 1

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

Accepted Answer

theoretical yield

Answer

mole ratio

Answer

actual yield

Answer

percentage yield

Question 2

What is the measured amount of a product obtained from a chemical reaction?

Accepted Answer

actual yield

Answer

mole ratio

Answer

theoretical yield

Answer

percentage yield

Question 3

Mole ratios are obtained from the

Accepted Answer

balanced chemical equation

Answer

periodic table

Answer

molar mass

Question 4

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation? P₄O₁₀ + 6 H₂O --> 4 H₃PO₄

Accepted Answer

6:4

Answer

4:6

Answer

1:3

Answer

3:1

Question 5

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

Accepted Answer

290 g

Answer

0.85 g

Answer

450 g

Answer

870 g

Question 6

How many grams are in 7.8 moles of NaCl?

Accepted Answer

452 grams

Answer

476grams

Answer

460 grams

Answer

462 grams

Question 7

What is the molar mass of Mg(NO₃)₂

Accepted Answer

148.313g/mol

Answer

134.306g/mol

Answer

54.311g/mol

Question 8

How many grams are in 7.80 moles of NaCl?

Accepted Answer

452 grams

Answer

476 grams

Answer

460. grams

Answer

462 grams

Question 9

How many grams are in 3.30 mol of potassium sulfide?

Accepted Answer

363 g

Answer

454 g

Answer

238 g

Answer

132 g

Question 10

How many atoms of iodine are in a mole of iodine?

Accepted Answer

6.02 x 10²³

Answer

53

Answer

63.55g

Answer

126.9

Question 11

How many octane molecules would be in 8.4 moles of octane (C₈H₁₈)?

Accepted Answer

5.06 x 10²⁴

Answer

5.77 x 10²³

Answer

5.77 x 10²⁶

Answer

5.06 x 10²³

Question 12

How many molecules are present in 25.0 g of NaBr?

Accepted Answer

1.46x10²³ molecules

Answer

103 molecules

Answer

0.240 molecules

Answer

2.34 x 10²⁰molecules

Question 13

5.11x10²³ atoms of lithium is equal to how many moles?

Accepted Answer

0.849

Answer

1.18

Answer

0.351

Answer

1.34

Question 14

What is the first thing you must do to solve a stoichiometry problem?

Accepted Answer

Write a Balanced Equation

Answer

Panic

Answer

Write an Unbalanced Equation

Answer

Ask for help

Question 15

True or False. You must convert grams to moles to do stoichiometry.

Accepted Answer

True

Answer

False

Question 16

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium with excfess water according to the following reaction?
1Mg + 2H₂O --> Mg(OH)₂ + H₂

Accepted Answer

62L

Answer

65L

Answer

31L

Answer

124L

Question 17

How do I change from moles to liters?

Accepted Answer

multiply by 22.4

Answer

divide by 22.4

Answer

multiple by Avo number

Answer

multiply by molar mass

Question 18

What is the molar volume of an ideal gas at STP?

Accepted Answer

1 mol = 22.4 L

Answer

1 mol = 0.0821 L

Answer

1 mol = 1 L

Answer

1 mol = 273 L

Question 19

What is the volume of 2 moles of gas at STP?

Accepted Answer

44.8 L

Answer

22.4 L

Answer

11.2 L

Answer

2 L

Question 20

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

Accepted Answer

8.8

Answer

13

Answer

0.99

Answer

1.0

Question 21

1Mg + 2H₂O --> Mg(OH)₂ + H₂

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium?

Accepted Answer

62.0 L

Answer

0.12 L

Answer

2.77 L

Answer

1.15 L

Question 22

You have 3.5 L of H₂ (g) at STP. How many moles of gas are there?

Accepted Answer

0.16 mol

Answer

22.4 mol

Answer

22.4 L

Answer

0.16 L

Question 23

When you use a balanced chemical equation to calculate the amount of a product on paper it is referred to as the

Accepted Answer

theoretical value

Answer

experimental value

Answer

true amount

Answer

percent yield

Question 24

Check the things you did to study

Accepted Answer

Studied the Outlines

Accepted Answer

Reviewed the Nearpods

Accepted Answer

Reviewed and completed my Homework Practice

Accepted Answer

Came to Tutorials or watched the YouTube Videos

Accepted Answer

Completed the concept builders

Question 25

The mass of one mole of an element is equal to

Accepted Answer

its atomic mass from the periodic table, but in grams.

Answer

its atomic number from the periodic table, but in amus.

Answer

its atomic mass from the periodic table, but in amus.

Answer

its atomic number from the periodic table, but in grams.

Question 26

The mass of one mole of an element is equal to

Accepted Answer

its atomic mass from the periodic table, but in grams.

Answer

its atomic number from the periodic table, but in amus.

Answer

its atomic mass from the periodic table, but in amus.

Answer

its atomic number from the periodic table, but in grams.

Question 27

How many formula units are in 2.5 moles of NaCl?

Accepted Answer

1.5 x10²⁴formula units

Answer

1.5 formula units

Answer

4.2 formula units

Answer

4.2 x10^-24molecules

Question 28

How many molecules are there in 31.8 moles of water?

Accepted Answer

1.91 x 10²⁵ molecules

Answer

5.28 x 10^-23 molecules

Answer

5.28x 10-²⁵

Answer

1.91 x 10²²

Question 29

Determine the mass of 4.20 moles of C₆H₁₂

Accepted Answer

353 g

Answer

0.0499 g

Answer

337 g

Answer

2.53 x 10²⁴ g

Question 30

Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 31

Calculate the number of atoms in 0.0340 g Zn.

Accepted Answer

3.13 x 10²⁰ atoms Zn

Answer

5.20 x 10^-4 atoms Zn

Answer

3.13 x 10²³ atoms Zn

Answer

2.05 x 10²² atoms Zn

Question 32

Which of the following dimensional analysis setups will correctly convert 4.00x10²³atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

Accepted Answer

setup A : 0.664 mol Co

Answer

setup B : 0.664 mol Co

Answer

setup A: 2.41x10⁴⁷mol Co

Answer

setup B: 2.41x10⁴⁷mol Co

Question 33

What is the molar mass of table salt (NaCl)? Read all options! Be careful!

Accepted Answer

58.44 g/mol

Answer

58.44 amu

Answer

35.45 g/mol

Answer

22.99 g/mol

Question 34

How many formula units are there in 2.45 moles potassium chloride?

Accepted Answer

1.47 x 10²⁴

Answer

4.07 x 10^-24

Answer

1.47

Answer

4.07

Question 35

6Na + Fe₂O₃--> 3Na₂O + 2Fe

If you are provided 200g of sodium and 250 grams of iron(III) oxide, how much of excess reagent is left?

Accepted Answer

18 g

Answer

232 g

Answer

250 g

Question 36

4NH₃+ 5O₂--> 4NO + 6H₂O

How many Liters of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?

Accepted Answer

1.01 L

Answer

1.5 L

Answer

2.02 L

Answer

8.30 L

Question 37

Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl₂.

1 Mg + 2 HCl --> 1 MgCl₂ + 1 H₂

Accepted Answer

HCl

Answer

Mg

Answer

H2

Answer

MgCl2

Question 38

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

Accepted Answer

Cl2

Answer

AlCl3

Answer

Al

Answer

None

Question 39

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?
1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

Accepted Answer

Oxygen

Answer

C₁₀H₈

Answer

Water

Answer

Carbon Dioxide

Question 40

The reactant that is not completely used up in a chemical reaction is called the __________ .

Accepted Answer

excess reagent

Answer

spectator reagent

Answer

limiting reagent

Answer

catalyst

Question 41

1. What is a limiting reagent?

Accepted Answer

any reactant used up first in a reaction.

Answer

any reactant left over at the end of a reaction.

Answer

the maximum amount of product formed from a given amount of reactant.

Answer

the purity of the reactant.

Question 42

When you use a balanced chemical equation to calculate the amount of a product on paper it is referred to as the

Accepted Answer

theoretical value

Answer

experimental value

Answer

true amount

Answer

percent yield

Question 43

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

Accepted Answer

85%

Answer

1.16%

Answer

116%

Answer

76%

Question 44

What is the measured amount of a product obtained from a chemical reaction?

Accepted Answer

actual yield

Answer

mole ratio

Answer

theoretical yield

Answer

percentage yield

Question 45

The limiting reactant

Accepted Answer

is used up first

Answer

slows the reaction down

Answer

is the reactant that is left over

Answer

controls the speed of the reaction

Question 46

A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield?

Accepted Answer

80.6%

Answer

6.3%

Answer

24.1%

Answer

58.5%

Question 47

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?
1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

Accepted Answer

Oxygen

Answer

C₁₀H₈

Answer

Water

Answer

Carbon Dioxide

Question 48

Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?

Accepted Answer

Fe

Answer

S

Answer

FeS

Answer

none

Question 49

The quantity, 22.4 L, is called the ........................ of a gas.

Accepted Answer

molar volume

Answer

molar mass

Answer

Atomic volume

Question 50

What is the volume of 5 moles of oxygen gas at RTP?

Accepted Answer

120 L

Answer

112 L

Answer

22.4 L

Answer

24 L

Question 51

What volume of hydrogen will be produced at RTP by the reaction 67.3 g of magnesium with excfess water according to the following reaction?

1Mg + 2H₂O --> Mg(OH)₂ + H₂

Ar values: Mg=24.3, H=1, O=16

Accepted Answer

62.0L

Answer

65L

Answer

31L

Answer

124L

Question 52

How many atoms of carbon are in 6.00g of carbon?

Accepted Answer

3.01x10²³atoms C

Answer

1.20x10²⁴atoms C

Answer

6.02x10²³atoms C

Answer

1.50x10²³atoms C

Question 53

How many molecules are in 2.5 mol of NaCl?

Accepted Answer

1.51x10²⁴

Answer

1.51x10²³

Answer

146

Answer

4.15

Question 54

What are the units for molar mass?

Accepted Answer

grams/mole

Answer

grams

Answer

amu

Answer

liters

Question 55

Avogadro's number of atoms/moles/formula units is equal to one_____.

Accepted Answer

mole

Answer

kilogram

Answer

gram

Answer

kelvin

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