Calculate the volume of a gas (in mL) produced from the reaction of 15.0 grams of magnesium carbonate in 100.0?

Calculate the volume of a gas (in mL) produced from the reaction of 15.0 grams of magnesium carbonate in 100.0 mL of 4.0 M hydrochloric acid at 25 C and 786 mm Hg and was collected over water.