Answer to Question #280779 in General Chemistry for Noryiel Glenoga

Question

A coffee-cup calorimeter contains 60.0 mL of distilled water at 22.7 °C. Solid ammonium bromide (3.00 g) is added and the solution is stirred, giving a final temperature of 18.3°C. Using the same assumptions find ΔHsoln for NH4Br (in kilojoules per mole).

Answer 1

= (50.0 x 60.0 + 100.0 x 30.0)/(50.0 + 100.0)

t_f = (3000 + 3000)/(150.0)

t_f = 40.0 ^oC .