We’re being asked to determine the molecular weight of the unknown gas.
Recall that molecular weight is in grams per 1 mole of a substance.
Step1: First, we have to calculate the amount of gas in moles using the ideal gas equation.
P = pressure, atm
V = volume, L
n = moles, mol
R = gas constant = 0.08206 (L·atm)/(mol·K)
T = temperature, K
Isolate n (number of moles of gas):
An experiment shows that a 248 -mL gas sample has a mass of 0.434 g at a pressure of 747 mm Hg and a temperature of 28 oC.
What is the molar mass of the gas?
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What scientific concept do you need to know in order to solve this problem?
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