A small pebble is heated and placed in a foam cup calorimeter containing water at 25 °C. The water reaches a maximum temperature of 27 °C. If the pebble released 532.1 J of heat to the water, what mass (in g) of water was in the calorimeter?

Question

A small pebble is heated and placed in a foam cup calorimeter containing water at 25 °C.  The water reaches a maximum temperature of 27 °C.  If the pebble released 532.1 J of heat to the water, what mass (in g) of water was in the calorimeter?

DrBob222 · Answer

heat lost by pebble + heat gained by water = 0 heat lost by pebble = 532.1 J heat gained by water = mass H2O x specific heat H2O x (Tfinal-Tinitial) Set q = heat gaine by water and solve for mass H2O.