Question

Which of the following will cause the volume of an ideal gas to triple in value?A) Raising the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3.B) Lowering the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3.C) Lowering the pressure by a factor of 3 while the temperature stays constant.D) Lowering the absolute temperature by a factor of 3 at constant pressure.E) Raising the temperature from 25 C to 75 C at constant pressure.

Answer 1

Answer:

C) C) Lowering the pressure by a factor of 3 while the temperature stays constant.

Explanation:

P V = nRT ⇒  V = nRT/P

Volume is directly proportional to  n, T and inversely proportional to P

a) Vfinal  = n R (3TI ) /3Pi = nRTi/Pi = Vi                                  FALSE

b) Vinal = n R (Ti/3) /(3Pi) = nRTi/Pi = (1/9) Vinitial                  FALSE

c)  Vfinal = n R(Ti/3) / Pi = nRTi/Pi = Vi                                    TRUE  

d) Vfinal = nR(Tinitial/3P = 1/3 Vi                                             FALSE

e) False we do not use ªC in the ideal gas law, we use K    FALSE