1.

The molar specific heat of oxygen at constant pressure, C_(p)7.03" cal/mol"^(@)C and R=8.31" Joules/mol"^(@)C. The amount of heat taken by 5 moles of oxygen when heated at constant volume from 10^(@)C" to "20^(@)C will be approximately:

Answer»

25 cal
250 cal
50 cal
500 cal

Solution :Here `C_(p)-C_(V)=(R )/(J)`
or `C_(v)=C_(p)-(R )/(J)`
`=7.03 -(8.31)/(4.18)=5.04` CALS/mol
`Q=5xxC_(v) xx Delta t`
`=5xx5.04 xx10 ~~ 250` cals
`therefore` Correct choice is (B).


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