Question

NaCl has a Delta. Hfus = 30. 2 kJ/mol. What is the mass of a sample of NaCl that needs 732. 6 kJ of heat to melt completely? Use q equals n delta H. 24. 3 g 82. 7 g 1,407. 1 g 1,417. 7 g.

Answer 1

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:

$Q=m\Delta H$

Computation for the mass of NaCl

The given solution has heat of fusion, $\Delta H_{fus}=30.2\rm kJ/mol$

The heat required to melt the sample has been, $Q=732.6\;\rm kJ/mol$

Substituting the values for the mass of NaCl

$\rm 732.6\;kJ/mol=Mass\;\times\;30.2\;kJ/mol\\\\ Mass=\dfrac{732.6}{30.2}\;g\\\\ Mass=24.3\;g$

The mass of NaCl sample has been 24.3 g. Thus, option A is correct.

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