Convert J/g to kJ/mole (chem)?

Question

how would i convert the specific heat capacity of ethanol ... 158J/g (what i got) to kJ/mole...

ps: ,methanol molar mass= 32

Answer 1

The molecular mass of ethanol (CH3CH2OH) is 46 g/mol.
You can get this by adding up the weights of each atom. The weight of carbon is 12, and there are 2 so 24, plus 6 hydrogens at 1 g/mol each, plus 1 oxygen which is 16g/mol. This would net you 46 g/mol of the compound.

So you would start with your Specific heat of 158 J/g and first convert from J/g => KJ/g by dividing by 1000, which would give you 0.0158 KJ/g.

Then, you must convert your 0.0158 KJ/g => KJ/mol by dividing by the molecular mass of 46 g/ mol, which would give you your answer of 0.000343 KJ/mol or you can write it as 3.43 x 10^4 KJ/mol.

Answer 2

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Answer 3

CH2CH2OH = 45 MW

158J/g / 1000J/kJ = 0.158 KJ/g

0.158KJ/g / 45g/mol = 0.00351 kJ/mol

Answer 4

158J/g /1000*32=5.056Kj/gmol