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Calculate the change in internal energy ...

Calculate the change in internal energy of a system which absorbs 100 J of heat and does 215 J of work.

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U_1 , q, w, U_2 are given. U_1 is internal energy, q is absorbed heat, w is work done and U_2 is final energy. a) Derive an equation for DeltaU. b) Give the equation for w. c) Calculate the change in internal energy of a system which absorbs 200 J of heat and 315 J of work is done by the system.

Calculate the change in the internal energy of a system which absorbs '500 J' of heat, and does work equivalent to '200 J' on the surroundigs.

Knowledge Check

  • Five moles of an ideal monoatomic gas with an initial temperature of 150^(@)C expand and in the process absorb 1500J of heat and does 2500J of work. The final temperature of the gas in ""^(@)C is (ideal gas constant, R= 8.314 xx JK^(-1) mol^(-1) )

    A
    134
    B
    126
    C
    144
    D
    166

  • Calculate the increase in internal energy of 1 kg of water at 100^(@)C when it is converted into steam at the same temperature and at 1 atm (100 kPa). The density of water and steam are 1000 kg m^(-3) and 0.6 kg m^(-3) respectively. The latent heat of vapourisation of water 2.25 xx 10 ^(6)J kg ^(-1)

    A
    `2.99 xx 10 ^(6) J`
    B
    `3.24 xx 10 ^(6) J`
    C
    `3.02 xx 10 ^(6)J`
    D
    `2.08 xx 10 ^(6) J`

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    Express the change in internal energy of a system when (i) No heat is absorbed by the system from the surroundings, but work (w) is done on the system. What type of wall does the system have?

    Express the change in internal energy of a system when (ii) No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. What type of wall does the system have?

    Express the change in internal energy of a system when (iii) w amount of work is done by the system and q amount of heat is supplied to the system what type of system would it be?

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    Calculate the increase in internal energy of 1 kg of water at 100^(@)C when it is converted into steam at the sa temperature and at 1 atm (100 kPa). The density of water and steam are 1000 kg m and 0.6 kg respectively. The latent heat of vapourisation of water =2.25 xx 10 ^(6) J kg ^(-1)

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