Question

A substance is 35.7% carbon by mass. How much carbon could be recovered from 769g of substance?

Answer 1

Answer : The mass of carbon recovered from 769 grams of substance is 274.5 grams.

Explanation :

As we are given 35.7 % carbon by mass that means 35.7 grams of carbon present in 100 grams of substance.

Now we have to calculate the mass of carbon recovered from 769 grams of substance.

As, 100 grams of substance recovered 35.7 grams of carbon

So, 769 grams of substance recovered $\frac{769}{100}\times 35.7=274.5$ grams of carbon

Therefore, the mass of carbon recovered from 769 grams of substance is 274.5 grams.

Answer 2

Below are the choice that can be found from other sources:

..22.9 
2..274 
3..180 
4..2290 
5.1.80 
6..258 
7..Not Enough Info

Below is the solution:

0.357 * 769g = 274.533g 
i.e. the answer is 2) 274 grams

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