Question

I am trying to figure out how many percent is C and H in C(supbscript 5)H(subscript 12). I started by finding the mass of the compound but what I learned in class did not help. I came up with 84.24g/mol as the total mass. Is this correct?

Answer 1

I don't think so. It's (12)5+(1)12

Answer 2

Then for percent of C it's just the total mass of C in the compound divided by the total mass of the compound multiplied with 100. Do the same for H using H mass.

Answer 3

This is of course if it's asking for percentage by mass. If by number, you don't need the mass.

Answer 4

5(12)+12(1)=72. That 72 would be amu or g/mol? I am first trying to find the molar mass in g/mol.

Answer 5

I think it works both ways. I usually write it as g/mol

Answer 6

I know where I went wrong. My math was a tad off and it threw off the rest of the problem. Thank you!

Answer 7

You're welcome