Which quantity of N2 gas has a volume of 11.2 liters at STP? What is the total mass in grams of 0.75 moles of SO2?

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Which quantity of N2 gas has a volume of 11.2 liters at STP?

What is the total mass in grams of 0.75 moles of SO2?

The percent by mass of nitrogen in N2O is