Answer to Question #140179 in General Chemistry for Emer Lindsay

Question

2.00 grams of magnesium carbonate are reacted with excess hydrochloric acid. If the density of carbon dioxide gas at atmospheric conditions is 24 L/mol, what is the volume of the gas evolved?

Answer 1

The reaction equation:

MgCO₃ + 2HCl = MgCl₂ + CO₂ + H₂O

The quantity of magnesium carbonate:

2.00 g / (84.31 g/mol) = 0.0237 mol

The quantity carbon dioxide is the same (according to the balanced equation above).

The volume of carbon dioxide:

0.0237 mol * 24 L/mol = 0.57 L

Answer: 0.57 L

Please note! that the "density" of any gas at atmospheric conditions is 22.4 L/mol (not 24!).

In this case the answer is: 0.0237 mol * 22.4 L/mol = 0.53 L