0.64 g of oxygen is kept ini a rigid container and is heated. Find the amount of heat required to raise the temperature from `20^(@)` to `30^(@)` C. The molar heat capacity of oxygen at constant volume is `20JK^(-1)mol^(-1)`

Explanation

Mass of the oxygen m = 0.64g
The molecular weight of oxygen M = 32 g`mol^(-1)`
`therefore` Number of moles of the gas is
`n = ("Mass"(m))/("Molecular weight" (M)) = 0.64 /32 = 0.02`
Molar heat capacity at constant volume `C_(V)` = 20`JK^(-1)mol^(-1)`
`therefore`The amount of heat required.
`DeltaQ = nC_(v)DeltaT` = `(0.02)(20)(30-20)` = 4J