A substance is 35.7% carbon by mass. How much carbon could be recovered from 769 g of the substance? 1. 180 mol 2. 258 mol 3. 2290 mol 4. Not enough information is given. 5. 22.9 mol 6. 1.80 mol 7. 274 mol

Question

Walter Wood

Chemistry

17 August, 15:42

A substance is 35.7% carbon by mass. How much carbon could be recovered from 769 g of the substance? 1. 180 mol 2. 258 mol 3. 2290 mol 4. Not enough information is given. 5. 22.9 mol 6. 1.80 mol 7. 274 mol

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Answers (1)

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Isabella Callahan · Answer 1

22.9 moles (Option 5)

Explanation:

A substance is 35.7% carbon by mass, means that in 100 g of substance, 35.7 g are C.

The rule of three will be:

100 g of substance ___ have __ 35.7 g of C

769 g of substance ___ have ___ (769. 35.7) / 100 = 274.5 g of C

1 mol of C = 12 g/m

Mass / Molar mass = Moles

274.5 g / 12g/m = 22.9 moles