Stoichiometry Mixed Practice

Quiz by Kylie Middleton

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19 questions
• Q1

How many moles of O2 will be formed from 1.65 moles of KClO3?

2 KClO3 🡺 2 KCl + 3 O2

2.47 mol

8.42 mol

0.14 mol

2.48 mol

30s
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• Q2

How many moles of Fe2O3 are produced when 0.275 moles of Fe is reacted?

4 Fe + 3 O2 🡺 2 Fe2O3

0.14 mol

0.137 mol

0.2 mol

.63 mol

30s
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• Q3

How many grams of Fe2O3 are produced when 42.7 grams of Fe is reacted?

4 Fe + 3 O2 🡺 2 Fe2O3

61g

56g

976g

65g

30s
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• Q4

How many moles of O2 are produced when 1.26 moles of H2O is reacted?

2 H2O 🡺 2 H2 + O2

.65 mol

45 mol

1.26 mol

.63 mol

30s
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• Q5

How many moles of O2 will be formed from 3.76 grams of KClO3?

2 KClO3 🡺 2 KCl + 3 O2

.046 mol

3.76 mol

.005 mol

.05 mol

30s
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• Q6

If 2.9 grams of NO2 are made, how many moles of NO reacted?

2  NO + O2  🡺  2NO2

.06 mol

2.9 mol

46 g

.60 mol

30s
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• Q7

How many grams of O2 will be formed from 12.00 moles of KClO3 react?

2 KClO3 🡺 2 KCl + 3 O2

32 g

576g

12 mol

420 g

30s
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• Q8

What mass of iron is needed to react with 16.0 grams of Sulfur?

8 Fe + S8 → 8 FeS

16g

224g

28g

256g

30s
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• Q9

How many moles  of FeS are produced from 36 grams of Iron?

8 Fe + S8 → 8 FeS

36 g

64 mol

.64 mol

.36 mol

30s
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• Q10

What mass of copper (II) sulfide would be formed if 18.5 moles of copper reacts?

8 Cu + S8 --> 8 CuS

1776g

18.5g

142g

17.76g

30s
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• Q11

What mass of water would be formed from the decomposition of 8.52 g of tin (IV) hydroxide?

Sn(OH)4 -->SnO2 + 2H2O

461g

1.64g

164g

16.4g

30s
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• Q12

If the burning of propane (C3H8) produces 15.0 moles of carbon dioxide, how many moles of oxygen were used?

C3H8 + 5O2 → 3CO2+ 4H2O

15 mol

250 mol

25 mol

2.5 mol

30s
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• Q13

What mass of Cd is produced if 85.0 g of Al2Se3 is produced?

3CdSe + 2Al --> Al2Se3 + 3Cd

291g

85g

98.14g

112 g

30s
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• Q14

How many moles of HF will be needed to react with 48 grams of Tin, Sn?

Sn + 2HF --> SnF2+ H2

48 mol

81.1 mol

96 mol

.81 mol

30s
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• Q15

What mass of H2SO4 would be required to react with 0.75 mol of NaOH?

H2SO4 + 2NaOH --> Na2SO4 + 2H2O

384g

36.75g

38g

32g

30s
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• Q16

What mass of H2O is formed when H2 reacts with 384 g of O2?

2H2 + O2 --> 2H2O

43g

432g

.75g

38.25g

30s
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• Q17

Calculate the number of moles of Hg(OH)required to react with 4.8 moles of H3PO4.

3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 +6H2O

6 mol

7.2mol

4.8mol

14.4 mol

30s
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• Q18

What mass of HCl is required to react with 5.50 g of Zn?

Zn + 2HCl→ ZnCl2 + H2

6.09g

3.04g

5.5g

198g

30s
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• Q19

What mass of CO is needed to produce 100.0 g of CO2?

2CO + O2 → 2CO2

100g

63.64g

4.55g

254.55g

30s
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