Calculate the molar mass of a gas at 351 torr and 45°C if 216 ng occupies 0.206 µL.?

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Calculate the molar mass of a gas at 351 torr and 45°C if 216 ng occupies 0.206 µL.?

2007-10-16 11:04:59 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

2 answers

PV=nRT
P= 0.462 atm
V= 2.06x10^-7 L
R= 0.08206
T= 318 deg K
n = grams/molar mass
grams = 2.16x10^-7 g
molar mass = 2.16x10^-7 x 0.08206 x 318 / (0.462 x 2.06x10^-7)
molar mass = 59.2

2007-10-16 11:14:53 · answer #1 · answered by skipper 7 · 0⤊ 1⤋

Obtain the moles of gas using the ideal gas law (Convert 45 C to absolute temp, Kelvin, use the appropiate value of R, you may also need to convert the volume to appropiate units, such as liters or cm3)

PV=nRT

n= PV/RT

divide the mass (in grams) by the moles obtained

Hey, RONALD, Do you think it is ok to solve someone else's homework just like that? Naive

2007-10-16 18:16:28 · answer #2 · answered by Manuelon 4 · 0⤊ 0⤋