12. you have a flask of liquid nitrogen at a temperature of -243 degree Celsius.

Question

12. you have a flask of liquid nitrogen at a temperature of -243 degree Celsius. you then heat the nitrogen until its temperature is doubled. What is the new temperature?
A) -486 deg Celsius B) 486 deg Celsius
C) -213 deg Celsius D) none of the above

14. suppose an ideal gas is in a container 8.0 L in volume and allowed to expand by having a piston move. the final volume after the piston moves is 16.0 L. if the gas is originally at a pressure of 33,000 Pa and a temperature of 300.0 K, and the temperature is maintained, what will be the new pressure?
A) 33,000 Pa B) 5,000,000 Pa C) 66,000 Pa D) 17,000 Pa

Explanation / Answer

12 .

new temperature is twice the value in K ;

original temp = ( -243 + 273 ) = 30 ;

new temp = 2 * 30 = 60 K ;

new temp in C = 60 -273 = -213 K <----------ans

so ( C ) is the correct answer = -213 C <--------ans

13 .

since the temperatue is maintained constnat ,

so

PV = constant ;

P1 V1 = P2 V2 ;

33,000 * 8 = P2 * 16 ;

or P2 = 16,500 Pa <---------ans

so D = 17000 Pa <--------ans is the correct answer

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