In a container of negligible mass

PHYSICS · Subjective · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

In a container of negligible mass,

30\,\text{g}

of steam at

100^\circ\text{C}

is added to

200\,\text{g}

of water at

40^\circ\text{C}

. If no heat is lost to the surroundings, what is the final temperature of the system? Also find the masses of water and steam in equilibrium. Take

L_v=539\,\text{cal/g}

and

c_{\text{water}}=1\,\text{cal g}^{-1}\,{}^\circ\text{C}^{-1}