If 34 g of a solid with a molar mass = 174 g/mol requires 21.3 kJ to melt it,what is the molar heat of fusion in kJ/mol?
A)(21.3)(174)(34)kJ/mol
B)(21.3/174)(34)kJ/mol
C)(21.3/174)/34 kJ/mol
D)(21.3)(174/34)kJ/mol
E)(34/21.3)(174)kJ/mol

Question

Quizplus · Accepted Answer

The molar heat of fusion is the energy required to melt one mole of a substance, which can be calculated using the equation:

molar heat of fusion = energy required to melt / number of moles melted

First, we need to find the number of moles melted:

number of moles = mass / molar mass

number of moles = 34 g / 174 g/mol

number of moles = 0.195402

Next, we can use the given energy and number of moles to calculate the molar heat of fusion:

molar heat of fusion = 21.3 kJ / 0.195402 mol

molar heat of fusion = 108.947 kJ/mol

Therefore, the correct answer is D, (21.3)(174/34) kJ/mol.

If 34 G of a Solid with a Molar Mass