If 100.0 g of water at 90'C is added to 50.0 g of water at 10'C, estimate the final temperature of the water. explain your reasoning.

Question

please my last question i really don't get it, :/

Answer 1

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

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

Answer 2

If 100.0 g of water at 90 ° C is added to 50.0 g of water at 10 ° C, estimate the final temperature of the water and explain your reasoning.