Question

Answer in three-four sentences: 4.1 The specific heat of copper is 0.09 cal/g °C. How much heat will be required to increase the temperature of a piece of copper weighing 70 g by 20 °C ?​

Answer 1

Answer:

Heat energy given by metal piece =m⋅c⋅ΔT

1

=20×0.3×(100−22)

=468J

Heat energy gained by water =m

w

×c

w

×ΔT

2

=m

w

×4.2×(22−20)

=m

w

×8.4J

Heat energy gained by calorimeter =m

c

×c

c

×ΔT

2

=50×0.42×(22−20)

=42J

By principle of calorimeter:

Heat lost = Heat gained

Heat energy given by metal = Heat energy gained by water + Heat energy gained by calorimeter

468=m

w

×8.4+42

m

w

=

8.4

468−42

=50.7g

Therefore, the mass f water used in the calorimeter is 50.7g