A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is 200 g, then latent heat of vaporization for the material of the object is (n/2) × 106 J / kg. If power supplied to the object is constant and equal to 1 kW, then find the value of n.

Question

A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is 200 g, then latent heat of vaporization for the material of the object is (n/2) × 106 J / kg. If power supplied to the object is constant and equal to 1 kW, then find the value of n. (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Heat used for evaporation =900 kJ Mass evaporated =0.2 kg ∴ Lv=(900 × 103/0.2) J / kg

Q. A heating curve has been plotted for a solid object as shown in the figure. If the mass of the object is 200g, then latent heat of vaporization for the material of the object is 2n​×106J/kg. If power supplied to the object is constant and equal to 1kW, then find the value of n.

Heat used for evaporation =900kJ Mass evaporated =0.2kg ∴Lv​=0.2900×103​J/kg

Heat used for evaporation $= 900 k J$
Mass evaporated $= 0.2 k g$
$∴ L_{v} = \frac{900 \times 1 0 ^{3}}{0.2} J / k g$