there are ______ moles of carbon present in 100 g of a compound with the following percentage composition…

there are ______ moles of carbon present in 100 g of a compound with the following percentage composition: $c = 40.0%$, $h = 6.72%$, $o = 53.29%$.\na 3.33\nb 6.66\nc 9.99\nd none of the above

there are ______ moles of carbon present in 100 g of a compound with the following percentage composition: $c = 40.0%$, $h = 6.72%$, $o = 53.29%$.\na 3.33\nb 6.66\nc 9.99\nd none of the above

Answer

Explanation:

Step1: Calculate mass of carbon

The compound is 100 g and carbon is 40.0% of it. So the mass of carbon $m_{C}=100\ g\times40.0% = 40\ g$.

Step2: Use molar - mass formula

The molar mass of carbon $M_{C}=12\ g/mol$. The number of moles $n=\frac{m}{M}$. So the number of moles of carbon $n_{C}=\frac{m_{C}}{M_{C}}=\frac{40\ g}{12\ g/mol}\approx3.33\ mol$.

Answer:

A. 3.33