16. Calculate the amount of heat energy that is needed (7. Calcula

to raise the temperature of 1000.0 g of sand from ll released

21.1 °C to 37.8 °C

temperat

q=m*C*A+

a = (1000.0 g) (0.670 J/g°C) (37.8 °C-21.1 °C)

a = 11189 J

q = 11200 J (sig figs)

18. If 11.500 T of energy is added to a 1000,0 9

19. If 11

=11189 J

Explanation:

The temperature change i caused by the enthalpy change of the sand and the consequent increase in kinetic energy.

Change in enthalpy = Mass of substance * Specific heat capacity * Temperature change.

ΔH = MC∅

M=1000.0g

C = 0.670 Jg°C

∅ = 37.8°C-21.1°C=16.7°C

ΔH = 1000.0g * 0.670J/g°C * 16.7 °C

=11189 J

Therefore the heat supplied to raise the temperature from 21.1 °C to 37.8°C is 11189 J.