# An unknown gas has pressure, volume and temperature of 0.9 atm 8L and 120°C respectively. How many moles of gas are present?

Question

An unknown gas has pressure, volume and temperature of 0.9 atm 8L and 120°C respectively. How many moles of gas are present?

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1 year 2021-09-03T16:13:29+00:00 1 Answers 32 views 0

n = 0.223 mol.

Explanation:

Hello there!

In this case, according to the given information, it is possible for us to approach this problem via the ideal gas law, which involves the pressure, moles, temperature and volume of the gas:

$$PV=nRT\\\\$$

Thus, by solving for moles we obtain:

$$n=\frac{PV}{RT}$$

Therefore, we plug in the given volume, temperature (in Kelvins) and pressure to obtain:

$$n=\frac{0.9atm*8L}{0.08206\frac{atm*L}{mol*K}*(120+273)K} \\\\n=0.223mol$$

Best regards!