# A gas exerts a pressure of 1080 mm HG at 75 C. What pressure is exerted by the gas at 0 C? HELP?

A gas exerts a pressure of 1080 mm HG at 75 C. What pressure is exerted by the gas at 0 C?

Please explain to me. I dont know how to use any of the gas laws for this problem.

Update:

I dont think thats right. The answer choices are:

A. 847 mm HG

B. 118 mm Hg

c. 726 mm Hg

D. 1360 mm Hg

Relevance

Gas pressures in a rigid container such as a scuba tank respond directly to Kelvin temperature, so the first chore is to get your temperatures into Kelvin degrees by adding 273 to each Celsius temp.

So you have 348 degrees C (273 + 75 degrees C)

and 273 + zero C = 273.

Now use the gas law, First pressure over first Kelvin temp = 2nd pressure over 2nd temp

l080 mm over 348 degrees = X mm over 273 degrees

set this up and cross multiply to get 847.2 mm pressure at the lower temp.

Source(s): retired chem teacher
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• Anonymous
8 years ago

That's P1T1 = P2T2

Plug in what you know and solve for what you don't.

You'll have to convert mmHG to ATM, because that's the standard unit for P.

760mmHG = 1 atm, so it's 1080/760 = 1.421atm

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