12- The amount of heat supplied o convert 100 gm of ice at 0°C to water at 0° C is:
(a) 3.34 X 10^5 Joules (b) 2.25 X 10 ^5Joules (c) 22.5 X 10^6 Joules (d) 33.4 X 10^3Joules. plz answer fast
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Answer:
Given: m=100g,t=2 minutes=2×60 sec.
Heat energy taken by ice at 0
∘
C to convert to water at 0
∘
C.
Q=mL=100×336=33600 J
∴P=
t
Q
=
2×60
33600
=280 J/S
The heat energy required to convert water at 0
∘
C to 20
∘
C.
Q=mc△t=100×4.2×20=8400 J
Q=P×t
8400=280×t
t=30sec=0.5 min
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