# Lasers and gas mixtures

A certain laser uses a gas mixture made up of 9.00 g HCL, 2.00 g H2, and 165.0 g Ne. What pressure is exerted by the mixture in a 75.0 L tank at 22 degree C? Which gas has the smallest partial pressure?

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#### Solution Preview

IDEAL GAS LAW AND PARTIAL PRESSURES

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To solve this problem, we need to know the ideal gas law equation:

PV = nRT

Let's plug in the numbers of what we know.

V = 75.0 L

T = 22 C = (22 + 273) = 295 K

R = 0.08206 L-atm/mol-K

What else? We need to know n (moles) in order to calculate P (pressure).

We need to determine the total number of moles of gas.

We have 9.00 g ...

#### Solution Summary

This solution discusses pressure exerted on a gas mixture.

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