Question

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

Answer 1

=11189 J

Step-by-step 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.