19Mass CalculationsHard1 markWhich reaction produces the smallest total number of moles of gas?[relative formula mass: CaCO3, 100.1; Sr(NO3)2, 211.6; BaCO3, 197.3]A3.60 g magnesium is added to 75.0 cm3 of 3.00 mol dm−3 sulfuric acidB16.0 g calcium carbonate is added to 50.0 cm3 of 4.80 mol dm−3 hydrochloric acidC10.6 g strontium nitrate is decomposed by heatingD27.6 g barium carbonate is decomposed by heatingGrade answerSolutionGrading criteria