Question 1

CH₄  +  2O₂  →  CO₂  +  2H₂O   What mass of carbon dioxide will be produced when 32g of methane is completely combusted in oxygen?

Accepted Answer

88g

Answer

16g

Answer

32g

Answer

44g

Question 2

C₃H₈  +  5O₂  →  3CO₂  +  4H₂O   What mass of carbon dioxide will be produced when 11g of propane is completely combusted in oxygen?

Accepted Answer

11g

Answer

33g

Answer

132g

Answer

44g

Question 3

Fe₂O₃(s) + 3CO(s) → 2Fe(l) + 3CO₂(g)    What mass of iron (III) oxide is required to produce 280kg of iron?

Accepted Answer

400kg

Answer

320kg

Answer

160kg

Answer

280kg

Question 4

The precentage by mass of sodium in sodium chloride (NaCl) is equal to

Accepted Answer

39.3%

Answer

60.7%

Answer

23%

Answer

58.5%

Question 5

The precentage by mass of iron in iron (III) oxide (Fe₂O₃) is equal to

Accepted Answer

70%

Answer

56%

Answer

48%

Answer

35%

Question 6

The precentage by mass of oxygen in calcium carbonate (CaCO₃) is equal to

Accepted Answer

48%

Answer

52%

Answer

40%

Answer

16%

Question 7

The precentage by mass of nitrogen in ammonium nitrate (NH₄NO₃) is equal to

Accepted Answer

35%

Answer

17.5%

Answer

82.5%

Answer

65%

Question 8

The precentage by mass of sodium in sodium phosphate is equal to

Accepted Answer

42%

Answer

58%

Answer

19.5%

Answer

14%

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