200 g of water are at 25°C. The water is heated to 75 °C by burning 2 g of ethanol. What is the amount of energy transferred to the water? A 0.418 kJ B 10.4 kJ C 41.8 kJ D 62.7 kJ
Answers
Given info : 200 g of water are at 25°C. The water is heated to 75 °C by burning 2 g of ethanol.
To find : The amount of energy transferred to the water is ...
solution : mass of water, m = 200g
initial temperature, T_i = 25°C
final temperature, T_f = 75°C
a/c to question,
The water is heated to 75°C by burning 2g of ethanol.
⇒heat transferred by Ethanol = mS∆T
= 200g × 4.18 j/g/°C × (75°C - 25°C )
= 200 × 4.18 × 50 j
= 10000 × 4.18 j
= 41800 j
= 41.8 × 10³ j
= 41.8 kJ
Therefore the amount of energy transferred by Ethanol to the water is 41.8 kJ.
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