A 30 g sample of water at 280 K is mixed with 50 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

1 answer

heat lost by warm water + heat gained by cool water = 0

[mass warm water x specific heat H2O x (Tfinal-Tinitial)] + [mass cool water x specific heat H2O x (Tfinal-Tinitial)] = 0
Substitute and solve for Tf.