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PSC: Chemistry > Chemical Reactions: Mole and Mass Relationship > Flashcards

Chemical Reactions: Mole and Mass Relationship Flashcards

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1
Q

The quantity, mole, is also known as?

A

Avogadro’s number.

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2
Q

Which number represents a mole of particles?

A

6.0221 x 10^23

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3
Q

If you put a mole of donuts over the surface of the earth, it would reach a height of?

A

8 km.

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4
Q

How many C atoms are in 0.50 mol of C?

A

3.01 x 10^23

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5
Q

How many SO2 molecules are in 1.28 moles of SO2?

A

7.71 x 10^23 molecules SO2

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6
Q

Calculate the number of moles of Fe in 5.22 x 10^22 atoms of Fe.

A

0.0867 mol Fe

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7
Q

Calculate the number of moles in 8.50 x 10^24 molecules of C2H6O.

A

14.1 mol C2H6O

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8
Q

How many moles of H are in 2.00 mol H3PO4?

A

6.00 mol H

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9
Q

How many moles of O are in 2.00 mol H3PO4?

A

8.00 mol O

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10
Q

How many atoms of P are in 2.00 mol H3PO4?

A

1.20 x 10^24 atoms P

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11
Q

How many atoms of O are in 2.00 mol H3PO4?

A

4.82 x 10^24 atoms O

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12
Q

Quinine, C20H24N2O2 is a drug commonly used to treat malaria and is a component of tonic water. How many moles of H are in 1.00 mol of quinine?

A

24 mol H

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13
Q

Quinine, C20H24N2O2 is a drug commonly used to treat malaria and is a component of tonic water. How many moles of C are in 5.00 mol of quinine?

A

1.0 x 10^2 mol C

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14
Q

Quinine, C20H24N2O2 is a drug commonly used to treat malaria and is a component of tonic water. How many moles of N are in 0.02 mol of quinine?

A

0.04 mol N

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15
Q

What is the molar mass of:
Fe2O3 (rust)

A

159.7 g/mol

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16
Q

What is the molar mass of:
C19H20FNO3 (Paxil, an anti-depressant)

A

329.4 g/mol

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17
Q

What is the molar mass of:
Al2(SO4)3 (active ingredient in antiperspirant)

A

342.2 g/mol

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18
Q

What is the molar mass of:
Mg(OH)2 (an antacid)

A

58.33 g/mol

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19
Q

Calculate the mass, in g, of 2.00 moles of Na.

A

Na atomic weight = 22.99

22.99 x2 = 46.0 mol

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20
Q

Calculate the mass, in g, of 2.80 moles of Ca.

A

112 g

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21
Q

Convert the following amounts into grams:
0.500 mol of NaCl

A

29.2 g

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22
Q

Convert the following amounts into grams:
1.75 mol of Na2O

A

108 g

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23
Q

Convert the following amounts into grams:
0.225 mol H2O

A

4.05 g

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24
Q

Convert the following amounts into grams:
4.42 mol CO2

A

195 g

25
Q

MgSO4 is more commonly known as Epsom Salts. It is used in water to help relieve aching muscles and sore feet. How many grams of Epsom Salts will you need to prepare a bath containing 5.00 mol of Epsom Salts?

A

602 g

26
Q

In a can of soda pop there are 0.25 mol of CO2 (what gives the pop “carbon”ation). How many grams of CO2 are in the can?

A

11 g

27
Q

The balanced chemical reaction when hydrogen gas reacts with oxygen gas to form water is:

2H2 + O2 → 2H2O

How many moles of H2 are required to react with 5.0 moles of O2?

A

10 mol of H2

28
Q

The balanced chemical reaction when hydrogen gas reacts with oxygen gas to form water is:

2H2 + O2 → 2H2O

How many moles of H2O form when 2.5 mol of moles of O2 react?

A

5 mol of H2O

29
Q

Carbon disulfide and carbon monoxide are produced when carbon is heated with sulfur dioxide:

5C + 2SO2 → CS2 + 4CO

How many moles of C are needed to react with 0.500 mol SO2?

A

1.25 mol of C

30
Q

Carbon disulfide and carbon monoxide are produced when carbon is heated with sulfur dioxide:

5C + 2SO2 → CS2 + 4CO

How many moles of CO are produced when 1.2 mol of C reacts?

A

0.96 mol CO

31
Q

Carbon disulfide and carbon monoxide are produced when carbon is heated with sulfur dioxide:

5C + 2SO2 → CS2 + 4CO

How many moles of SO2 are needed to produce 0.50 mol of CS2?

A

1.0 mol SO2

32
Q

Carbon disulfide and carbon monoxide are produced when carbon is heated with sulfur dioxide:

5C + 2SO2 → CS2 + 4CO

How many moles of CS2 are produced when 2.5 mol of C reacts?

A

0.50 mol of CS2

33
Q

Sodium reacts with oxygen to produce sodium oxide:

4 Na + O2 -> 2 Na2O

How many grams of Na2O are produced when 57.5g of Na reacts?

A

77.5g of Na2O

34
Q

Sodium reacts with oxygen to produce sodium oxide:

4Na + O2 → 2Na2O

How many grams of O2are required to react with 18.0 g of Na?

A

Looking for O2 required so need to used conversion factors.

=18g Na (1 mol Na/22.99 gNa) (1 mol O2 /4 mol Na) (32 g O2 / 1 mol O2)

= 6.26 g

35
Q

Sodium reacts with oxygen to produce sodium oxide:

4Na + O2 → 2Na2O

How many grams of O2are required to produce 75.0 g of Na2O?

A

= 75.0 g ( 1 mol Na2O / 61.98 g/mol Na2O) (1 mol O2 / 2 mol Na2O) (32 g O2 / 1 mol O2)

= 19.4 g of O2

36
Q

Ammonia and oxygen react to form nitrogen and water:

4NH3 + 3O2 → 2N2 + 6H2O

How many grams of O2 are needed to react with 13.6 g of NH3?

A

19.2 g of O2

37
Q

Ammonia and oxygen react to form nitrogen and water:

4NH3 + 3O2 → 2N2 + 6H2O

How many grams of N2 will be produced if 6.50 g of O2 reacts?

A

3.79 g of N2

38
Q

Ammonia and oxygen react to form nitrogen and water:

4NH3 + 3O2 → 2N2 + 6H2O

How many grams of H2O will be produced if 34.0 g of NH3 reacts?

A

54.0 g of H2O

39
Q

Nitrogen dioxide and water react to form nitric acid and nitrogen monoxide:

3NO2 + H2O→ 2HNO3 + NO

How many grams of H2O are needed to react with 28.0 g of NO2?

A

3.66 g of H2O

40
Q

Nitrogen dioxide and water react to form nitric acid and nitrogen monoxide:

3NO2 + H2O→ 2HNO3 + NO

How many grams of NO are produced from 15.8 g of NO2?

A

3.44 g NO

41
Q

Nitrogen dioxide and water react to form nitric acid and nitrogen monoxide:

3NO2 + H2O→ 2HNO3 + NO

How many grams of HNO3 are produced from 8.25 g of NO2?

A

7.53 g of HNO3

42
Q

When lead (II) sulfide ore burns in oxygen gas, the products are lead (II) oxide and sulfur dioxide gas. What is the balanced chemical equation for this reaction?

A

2PbS + 3O2 → 2PbO + 2SO2

43
Q

How many grams of oxygen are required to react with 30.0 g of lead (II) sulfide?

2PbS + 3O2 → 2PbO + 2SO2

A

6.02 g O2

44
Q

How many grams of sulfur dioxide can be produced when 65.0 g of lead (II) sulfide reacts?

2PbS + 3O2 → 2PbO + 2SO2

A

17.4 g SO2

45
Q

How many grams of lead (II) sulfide are used to produce 128 g of lead (II) oxide?

2PbS + 3O2 → 2PbO + 2SO2

A

137 g PbS

46
Q

In the process of assembling bicycles, you have 114 frames, 300 tires, 75 seats, 109 sets of pedals, and 84 sets of handle bars. Which is the limiting reactant in this process?

A

Seats.

47
Q

In the process of baking a cake, the recipe calls for 2 eggs, 2 cups of flour, 2 teaspoons of baking powder, 1/4 pound of butter, and 1 cup of sugar. A baker has the following available:
3 dozen eggs, 30 cups of flour, 24 teaspoons of baking powder, 5 pounds of butter, and 20 cups of sugar. Which is the limiting reactant in this process?

A

Baking powder.

48
Q

A recipe for punch calls for 3 cans of orange juice, 3 cans of pineapple juice, 3 cans of apricot nectar, 3 L of pineapple sherbet and 3 L of lemon lime soda. You have the following available: 9 cans of orange juice, 12 cans of pineapple juice, 15 cans of apricot nectar, 20 L of pineapple sherbet and 11 L of lemon lime soda. Which is the limiting reactant in this process?

A

Orange juice.

49
Q

When nitrogen gas reacts with hydrogen gas, ammonia gas is formed. If 0.95 g of hydrogen gas react with 4.75 g of nitrogen gas, which reactant will be the limiting reactant?

A

Hydrogen gas.

50
Q

Aluminum reacts with oxygen to form aluminum oxide. If 27.85 g of aluminum reacts with 21.95 g of oxygen gas, which is the limiting reactant and which is the excess reactant?

A

27.85 gAl x 3 gO2 / 4 gAl = 20.89 O2

21.95 gO2 x 4 gAl / 3 gO2 = 29.27 Al

Therefore Oxygen gas is the limiting reactant and aluminum is the excess reactant.

51
Q

When hydrogen gas reacts with chlorine gas, hydrogen chloride gas is formed. If 2.27 mol of hydrogen gas react with 2.27 mol of chlorine gas, which reactant will be the reactant in excess?

A

Neither reactant will be in excess.

52
Q

A chemist reacts 4.04 g hydrogen gas reacts with 32.00 g of oxygen gas to produce water vapour. Which reactant will be the excess reactant?

A

Neither will be the LR.

53
Q

The theoretical yield of MgCO3 is 25.8 g. If the % yield of the MgCO3 in a reaction is 83.5 %, what amount of MgCO3 will be obtained?

A

21.5 g

54
Q

How many grams of nitric acid, HNO3, can be prepared from the reaction of 138 g of NO2 with 54.0 g H2O according to the equation below?

3NO2 + H2O → 2HNO3 + NO

A

126

55
Q

How many grams of H2O will be formed when 32.0 g H2 is allowed to react with 16.0 g O2 according to

2H2 + O2 → 2H2O

A

18 g H20

56
Q

Silicon carbide, an abrasive, is made by the reaction of silicon dioxide with graphite.

SiO2 +3C –> SiC + 2CO

If 100 g of SiO2 and 100 g of C are reacted as far as possible, how much excess reactant will be left over?

A

40 g of C will be left over.

57
Q

In a chemical reaction, 52.85 g of product forms. The amount calculated using the balanced chemical equation is 81.25 g. What is the percentage yield?

A

Percent yield = actual yield / theoretical

65.05%

58
Q

When solid carbon reacts with oxygen gas, carbon dioxide gas is formed. If 4.53 g of carbon react with 8.21 g of oxygen gas, which reactant will be the limiting reactant?

A

Step 1: Find the theoretical yield of both products. Whatever product has a lower theo. yield it is the limiting reagent.

Oxygen gas.

PSC: Chemistry (9 decks)

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