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CH$19$

$4$ mol $348\mathrm{.}15$ K $(75$C$)30$ bar $2\mathrm{.}5$ mol $$ argon $403\mathrm{.}155$ K $(130$ C$)20$ bar $$adiabatically $$ entropy? $$ CV $=(5/2)*$ R $$ argon $$ CV $=(3/2)*$ R $$