Question

A 13.00 g sample of citric acid reacts with an excess of baking soda as shown in the equation. What is the theoretical yield of carbon dioxide?

Answer 1

The answer on the quiz would be (d) 8.93 g 

Answer 2

Chemical equation of the reaction between citric acid and baking soda:


`C_(6) H_(8) O_(7) +3NaHCO_(3) -\ \textgreater \ Na_(3) C_(6) H_(5) O_(7) +3 H_(2) O+3CO_(2)`

Ratios

Citric Acid Baking soda -> Sodium Citrate Water Carbon Dioxide
C6H8O7 CO2
1 mole 3moles

Molecular masses
Citric acid
6*12 + 8*1 + 7*16 = 192 g/mole
Carbon dioxide
12 + 2*16 = 44 g/mole

Proportion carbon dioxide / citric acid

3 * 44 g of carbon dioxide / 192 g of citric acid

132 g of carbon dioxide / 192 g of citric acid

13.00 g of citric acid * [132 g of carbon dioxide / 192 g of citric acid] = 8.94 g of carbon dioxide.

Answer: 8.94 grams.