Jim
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GIven 46.0 g, write that down and apply converters (1)
46.0 g (1 mol/22.989769g) (2.60 kJ/mol) leaves just 'kJ' and cancels other units
5.202314125035358119 kJ
round to 3 sigfigs = 5.20 kJ
david
Q = Lf X n ... Lf = heat of fusion .. n = number of moles
n = mass / molar mass = 46.0 / 23 = 2 moles
Q = 2.60 X 2 = 5.200 kJ <<< round for sig figs