What amount of heat must be supplied to 35 g of oxygen at room temperature to raise its temperature by 80 °C at constant volume (molecular mass of oxygen is 32 and R = 8.3 J mol-1 k-1)

Question

What amount of heat must be supplied to 35 g of oxygen at room temperature to raise its temperature by 80 °C at constant volume (molecular mass of oxygen is 32 and R = 8.3 J mol-1 k-1) (A) 1.52 kJ (B) 3.23 kJ (C) 1.81 kJ (D) 1.62 kJ

Tardigrade Admin · Accepted Answer

Here mass of oxygen (m) = 35 g, molar mass of O2 (M) = 32 g mol-1 rise in temperature, ÎT = 80 Â°C ∴ number of moles n=(m/M)=(35/32)=1.09 mol As oxygen is a diatomic gas, then molar specific heat at constant volume is CV=(5/2)R and amount of heat supplied to gas ÎQ = nCVÎT =1.09×(5/2)R Ã80=1.09 Ã (5/2) Ã 8.3 Ã 80 =1809.4 J=1.8094 kJ 1.81 ≃ 1.81 kJ

Q. What amount of heat must be supplied to $35 g$ of oxygen at room temperature to raise its temperature by $80^{°} C$ at constant volume (molecular mass of oxygen is $32$ and $R = 8.3 J m o l^{- 1} k^{- 1}$ )

$1.52 k J$

$3.23 k J$

$1.81 k J$

$1.62 k J$

Q. What amount of heat must be supplied to 35g of oxygen at room temperature to raise its temperature by 80°C at constant volume (molecular mass of oxygen is 32 and R=8.3Jmol−1k−1)

1.52kJ

3.23kJ

1.81kJ

1.62kJ

Q. What amount of heat must be supplied to $35 g$ of oxygen at room temperature to raise its temperature by $80^{°} C$ at constant volume (molecular mass of oxygen is $32$ and $R = 8.3 J m o l^{- 1} k^{- 1}$ )

$1.52 k J$

$3.23 k J$

$1.81 k J$

$1.62 k J$