Ice at is added to of water initially at in a vacuum flask

PHYSICS · Numerical · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Ice at

0^{\circ}\mathrm{C}

is added to

200\ \mathrm{g}

of water initially at

70^{\circ}\mathrm{C}

in a vacuum flask. When

50\ \mathrm{g}

of ice has been added and has completely melted, the temperature of the flask and contents is

40^{\circ}\mathrm{C}

. When a further

80\ \mathrm{g}

of ice has been added and has completely melted, the temperature becomes

10^{\circ}\mathrm{C}

. Find the latent heat of fusion of ice.