A 50-g sample contains 32.1 g of oxygen (O), 2 g of hydrogen (H), and 15.9 g of carbon (C). Which of these are correct?

% oxygen is 64.2%

% hydrogen is 4%

percent composition of all elements is 50%

% carbon is 31.8%

Question

A 50-g sample contains 32.1 g of oxygen (O), 2 g of hydrogen (H), and 15.9 g of carbon (C). Which of these are correct?
		
% oxygen is 64.2%
		
% hydrogen is 4%
		
percent composition of all elements is 50%
		
% carbon is 31.8%

anonymous · Answer

@Astrophysics  Can you help me ?

astrophysics · Answer

It's the same as before

astrophysics · Answer

You can take the ratio for all of them and see which one is correct

astrophysics · Answer

$$\frac{ \text{mass of element} }{ \text{total sample mass} } \times 100$$

astrophysics · Answer

We have derived this equation from the last question :) now lets apply it!

anonymous · Answer

Do i suppose to divide carbon and 50 g ? @Astrophysics

astrophysics · Answer

Yes, do it with all the elements and see which of your options agrees