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For 1 mol of a triatomic ideal gas C(v) ...

For 1 mol of a triatomic ideal gas `C_(v) = 3R (R` is universal gas constant). Fid `delta (=C_(p)//C_(v))` for that gas.

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For 1 mol of an ideal gas, `C_(p) - C_(v) = R`
`:. C_(p) = C_(v) + R = 3R + R = 4R :. Delta = (C_p)/(C_v) = (4R)/(3R) = 4/3`.
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