Please I need help with questions 14 and 15 and it’s very hard and I’m struggling with it and if you need to see the picture big
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The mass of NaCl sample has been 24.3 g. Thus, option A is correct.
The heat of fusion has been the amount of heat required to convert 1 mole of substance into solid to liquid state.
The heat required has been given as:
The given solution has heat of fusion,
The heat required to melt the sample has been,
Substituting the values for the mass of NaCl
The mass of NaCl sample has been 24.3 g. Thus, option A is correct.
Learn more about heat of fusion, here: