Answer:
18g C
Explanation:
A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The mass of that sample is:
5.0 g + 10.0 g + 20.0 g = 35.0 g
The ratio mC/mX is:
[tex]\frac{mC}{mX} =\frac{10.0gC}{35.0gX} =\frac{0.29gC}{1gX}[/tex]
According to the law of definite proportion, this ratio is constant for the same chemical. For a sample of 61 g of X,
[tex]61gX.\frac{0.29gC}{1gX}=18gC[/tex]
