a) What is the amount of heat needed to raise the temperature of 1kg ice from 10

Question

a) What is the amount of heat needed to raise the temperature of 1kg ice from 10 degree C to 0 degree C ? b) What is the amount of heat needed to melt 1kg ice at 0 degree C ? c) What is the amount of heat needed to raise the temperature of 1kg water from 0 degree C to 100 degree C ? d) What is the amount of heat needed to vaporize 1kg water at 100 degree C ? (Given: L_r = 333 times 10^3 J/kg, L_p = 2256 times 10^3 J/kg, C_water = 4186 J kg^-1 degree C^-1, C_ice. = 2100 J kg^-1 degree C^-1) What is the equation of state for ideal gases ? What are the standard temperature and pressure (STP)? what is the volume of 1 mole of any ideal gas at STP ? What is the rms speed for Oxygen at STP ? Draw a pV diagram for the following processes: one mole in a cylinder initially at the point of STP: a) an isobaric expansion to 33.6 L; and then b) an isochoric cooling to 0 degree C; and then c) an isothermal compression back to 1.0 atm. A cylinder of an ideal gas undergoes a process. It absorbs 10 J of heat in the process. a) What is the work done by the gas if the process is isothermal ? What is the qualitative change in pressure? b) What is the change of its internal energy if the process is isochoric ? what is the qualitative change in temperature ?

Explanation / Answer

Q. 16

a) Q = mCdelta T = 1 ( 10-0) ( 4186) = 41860 J

b) Q= mL = 1 ( 333x 10^3)= 333 x 10^3 J

c) Q = 1 (100) ( 4186) = 418600 J

d) q=1 ( 2256 x 10^ 3) = 2256 x 10^3 J

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