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samuro_bm
samuro_bm asked in Science & MathematicsPhysics · 1 decade ago

Physics problem help? entropy, heat q, reservoir..?

I've been stuck on this problem for an hour and need help.

4 moles of gas (diatomic ideal) are heated by a thermal reservoir (at constant 436.7K) from 300K to 400K at constant pressure. Change in entropy for the universe?...

I tried using Q=ncp(deltaT) and got 11640 for the heat added

S=Q(1/Tc-1/Th) and got 2.4455, but the answer range is 5-8.

What am I doing wrong!!!

1 Answer

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  • Pearlsawme
    Lv 7
    1 decade ago
    Favorite Answer

    The specific heat capacity for diatomic molecule is 4.5 R and is not 3.5 R.

    4.5 R = 4.5*8.3145 =37.41525 units

    For 4 molecules and for 100 K differnce , Q = 14966. Joules

    Now try again.

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