# HELP WITH CHEMISTRY ?

If you have 0.065 grams of c7H8 and have 0.0007 moles in the sample how many moles and grams of each element do you have? Please explain I’m a very confused high school student.

### 1 Answer

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- Roger the MoleLv 72 months ago
(0.0007 mol C7H8) x (7 mol C / 1 mol C7H8) = 0.0049 mol C

(0.0049 mol C) x (12.01078 g C/mol) = 0.059 g C

(0.0007 mol C7H8) x (8 mol H / 1 mol C7H8) = 0.0056 mol H

(0.0056 mol H) x (1.007947 g H/mol) = 0.0056 g H

Checking:

0.059 g C + 0.0056 g H = 0.0646 g total, which is the same as the given 0.065 g within the limits of significant digits

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