NaCl has a triangle cap h sub fus is equal to 30 point 2 kJ over mol What is the mass of a sample of NaCl that needs 732 point 6 kJ of heat to melt completely? Use q is equal to n triangle cap h

Use q = nΔHfus to find the amount of NaCl: n = 732.6 kJ ÷ 30.2 kJ/mol ≈ 24.26 mol. The molar mass of NaCl is about 58.44 g/mol, so the sample’s mass is 24.26 mol × 58.44 g/mol ≈ 1,417.7 g. The correct choice is D, 1,417.7 g.

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