Question

Calculate the final temperature (once the ice has melted) of a mixture made up initially of 75.0 ml liquid water at 29.0 degrees C and 7.0 g ice at 0.0 degrees C.

Answer 1

q1 = heat to melt ice at zero C.
q1 = mass ice x heat fusion.

q2 = heat to move temperature liquid water (from the ice) at zero C to final T.
q2 = mass water x specific heat water from ice x (Tfinal-Tinitial).

q3 = heat to move 75 mL water from 29 to tinal T.
q3 = mass 75 mL water x specific heat water x (Tfinal-Tinitial).
Total Q = q1 + q2 + q3.
Watch the signs and watch the units.

Answer 2

q1 = +6.3 µC q2 = +2.6 µC q3 = −3.9 µC = 0 cm, x = 2.0 cm x = 5.5 cm