1. How many grams of CO₂ (44.01 g/mol) are produced from the complete combustion of 0.25 mol of butane, C₄H₁₀ (58 g/mol)?

A. 11 g
B. 44 g
C. 22 g
D. 88 g
E. 15 g

2. How many grams of Mg (24 g/mol) are needed to react with excess HCl (36.5 g/mol) to obtain 0.90 mol of MgCl₂ (95.2 g/mol) if the reaction has 90% yield?

Mg + 2 HCl → MgCl₂ + H₂

A. 22 g
B. 2.4 g
C. 24 g
D. 12 g
E. 48 g