Question

A balloon can be inflated with 4.23 Liters of O2gas at STP. How much will the balloon weigh in grams?

Answer 1

Answer: 6.04 g

Explanation: In STP conditions, amoint of substance

n = V / Vm = 4.23 l / 22.41 l/mol = 0.188755 mol

Molar mass M(O2) = 32 g/mol and

mass m = nM