Under normal conditions, 1 mol of gas occupies a volume of 22.4 liters.
Knowing the volume of gas at normal conditions. we can find its quantity.
n = 33.6 / 22.4 = 1.5 mol of substance. Molar mass of oxygen = 32 g / mol
Knowing the molar mass and the amount of a substance, it is easy to find the mass of a gas in a given volume.
m = 1.5 * 32 = 48 g.
Answer: the mass is 33.6 liters of oxygen at standard conditions. is equal to 48 g.
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