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.

h let me think

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.