Calculate molar mass?

calculate molar mass of gas if 2.50g occupies .875 L at 685 torr and 35 Celsius

Answer:
80.2 g/mol

use the ideal gas law to find moles, (n) and then divide by grams to obtain molar mass (g/mol)
PV=nRT

n=PV/RT

g/n = g/mol = molar mass (ans)

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