Calculate the mass of each gas sample at STP.

Question

Calculate the mass of each gas sample at STP.

Part A

5.86 L NO

Part B

0.324 L N2

Part C

137 cm^3 Ar.

Answer 1

Recall that at STP, 1 mol of any ideal gas = 22.4 L

A). 5.86 L NO x 1 mol NO / 22.4 L = 0.2616 mols NO x 30 g NO / mol = 7.85 g NO

B). 0.324 L N₂ - do this the same way as A above

C). 137 cm3 Ar x 1 L / 1000 cm3 = 0.137 L Ar x 1 mol / 22.4 L = 0.006116 mols x 39.95 g/mol = 0.244 g Ar