14. Which of the following relations is used for determining the heat required for a change of state of a substance and why? Q = mxL or Q= m×C×T
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I think the answer is Q= mxL because we know the values of L when state changes from ice to water and water to vapour .
Ex:when 0°c ice converts to 0°c water.
formula Q= m×C×T is used when substance undergoes changes with in the state
Ex:0°c water converts to 60°c of water
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