`0.32 g` of oxygen is kept in a rigid container and is heated. Find the amount of heat needed to raise the temperature from `25^0 C to 35^0 C`. The molar heat capacity of oxygen at constant volume is `20 J K^(-1) mol^(-1)`.

Explanation

The molecular weight of oxygen `= 32 g mol^(-1)`.
The amount of the gas in moles is
`n=0.32 g / 32 g mol^(-1) = 0.01 mol`.
The amount of heat needed is `Q = n C v Delta T
(0.01 mol) (20 J K ^(-1) mol ^(-1) (10 K ) = 2.0 J`.