17.) An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at the temperatur

Question

17.) An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at the temperature of 30 degrees Celsius . How many molecules are there in the gas?

A) 2.3 X 10^23 B) 2.4 X 10^22 C) 6.1 X 10^23 D) 6.0 X 10^22

19.) Heat is added to a 6.0 kg piece of ice at a rate of 731.0kW. How long will it take for the ice at 0.0 degrees Celsius to melt? (For water Lf=334 kJ/kg and Lv = 2257 kJ/kg.)

A) 2.7 s                          B) 0.0 s                               C) 2000 s                             D) 1,500,000 s

20.) An ideal gas has a volume of 0.20 m^3, a temperature of 30 degree Celsius, and a pressure of 1.0 atm. It is heated at 60 degree Celsius and compressed to a volume of 0.15 m^3. What is the new pressure?

A) 2.7 atm                        B) 1.0 atm                           C) 1.2 atm                        D) 1.5atm

Explanation / Answer

17) D

N = avogadro number*numer of moles = PV/RT = 6.023*(10^23)*2.5/(0.0821*303)

19)C

time taken = Lf*m/wnergy given = 334*6/731

20) D

P1 V1/T1 = P2 V2 /T2

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