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4 June, 01:14

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

+3
Answers (1)
  1. 4 June, 03:12
    0
    =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.
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