A sample of helium occupies a volume of 101.2 mL at a pressure of 790 mmHg. at what pressure would the volume be 120 mL?

Answer : The final pressure will be, 666.2 mmHg

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

or,

where,

= initial pressure = 790 mmHg

= final pressure = ?

= initial volume = 101.2 mL

= final volume = 120 mL

Now put all the given values in the above equation, we get:

Therefore, the final pressure will be, 666.2 mmHg

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