Q6 / 160 · TS EAMCET 2010 · Chemistry

A system is provided with $50 \mathrm{~J}$ of heat and the work done on the system is $10 \mathrm{~J}$. What is the change in internal energy of the system in joules?

  • Correct answer
    A
    60
  • B
    40
  • C
    50
  • D
    10

Solution

From first law of thermodynamics, $\Delta E=Q+W$ Since, heat is provided to the system, $Q=+50 \mathrm{~J}$ and work is done on the system, $W =+10 \mathrm{~J}$ $\therefore \Delta E =50+10=60 \mathrm{~J}$

Hence, the correct answer is option: 'A'.

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