Question

How much heat is given off when 10 grams of water are cooled from 50°C to 40°C?

Answer 1

Answer:

0.396 BTU

Explanation:

Convert 10 grams to pounds:

10

⋅

0.0022

=

0.022

pound

Convert 50 degrees C to Fahrenheit:

(

50

⋅

9

5

)

+

32

=

122

degrees Fahrenheit

Convert 40 degrees C to Fahrenheit:

(

40

⋅

9

5

)

+

32

=

104

degrees Fahrenheit

Calculate the change in temperature:

122

−

104

=

18

degrees Fahrenheit

Heat lost in British Thermal Units (BTU):

0.022

⋅

18

=

0.396

BTU

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