simple question on thermodynamics!?

Question

What's the molar heat capacity of ethanol, C2H5OH(l)?
* The specific heat of ehtanol is 2.46 J/g℃

I think the question is wrong because the unit of specific heat is J/g, isn't it?? and J/g℃ is for specific heat capacity? so, when you're solving, change the unit if it needs to be changed.

Answer 1

You are given 2.46 J/g

Molar heat capacity would be an amount of heat (J) per mole

So, you need to change grams to moles. This is done with the molar mass of ethanol, since that gives a conversion between moles and grams.

Mm C2H5OH = 46 g /mol

2.46 J / g * 46 g / mol = 113 J / mol

Answer 2

Total heat capacity would be J/℃, but specific heat is J/g-C or J/g-K.

Anyway, here's how you convert it....

C is 12 I think
H is 1
O is 16

You have 2 Cs, 6 Hs, and an O

24 + 6 + 16

So 46 amu is the molecular weight

That's 46 grams per mole

If it's 2.46J/g-C, then it's....

2.46J/g (46grams / mole) = 113.16 J/mol-K (J/mol-C)

Check my number on the Carbon.