Calculate the density of a gas if the mass is 2.94 grams, the volume is 756 mL at 20°C...?

Calculate the density of a gas if the mass is 2.94 grams, the volume is 756 mL at 20°C and 500 torr, and the conditions are changed to STP.

Answer:
At STP density = molar mass / molar volume.
We know that molar volume = 22.4 so we must know the molar mass of the unknown gas.
We use the equation pV = nRT
n = pV / RT

V = 0.756 L
T = 20 + 273 = 293 K
p = 500 / 760 = 0.658 atm
n = 0.658 x 0.756 / 0.0821 x 293 = 0.0207

2.94 g / 0.0207 = 142 g /mol ( molar mass )


d ( at STP) = 142 / 22.4 = 6.34 g/L
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