Question

If 16 grams of O2 react with excess C2H6, how many grams of CO2 will be formed? The formula mass of O2 = 32 amu and the formula mass of CO2 = 44 amu. The balanced chemical equation is

2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g)

Select one:

a.
13 g

b.
3 g

c.
22 g

d.
9 g

Answer 1

The correct answer is A. 13 g. 16 g of O2 will react with 8 g of C2H6 (2 moles of C2H6 requires 14 moles of O2). This will produce 8/4 = 2 moles of CO2, which is 88 g of CO2. When rounded to the nearest whole number, this is 13 g.

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