the presure of a sample gas is at a constant volume of 7.0atm to 90degrees celcis what is the presure at 30 degrees celcius

2.33 atm

Explanation:

using gas equation, PV=nRT

here V volume is constant and n&R is also constant

now clearly we can state that

Pressure is directly proportional to temperature

now, temperature changes from 90°C to 30°C

i. e, becomes one third of original

since it's pressure is directly proportional, therefore it will also became, one third of original

i. e, 1/3 * 7.0 atm

=7/3 atm

=2.33 atm