How many kJ of heat are needed to completely melt 46.0 g of sodium metal? The heat of fusion for this metal is 2.60 kJ/mol.?

Jim2020-05-06T16:00:56Z

Favorite Answer

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

david2020-05-06T15:35:38Z

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