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

there are ______ moles of oxygen present in 100 g of a compound with the following percentage composition: $c = 40.0%$, $h = 6.72%$, $o = 53.29%$.\na 1.68\nb 3.33\nc 6.25\nd none of the above

there are ______ moles of oxygen present in 100 g of a compound with the following percentage composition: $c = 40.0%$, $h = 6.72%$, $o = 53.29%$.\na 1.68\nb 3.33\nc 6.25\nd none of the above

Answer

Explanation:

Step1: Calculate mass of oxygen

Given 100 g of compound and oxygen is 53.29% by mass. So mass of oxygen $m_O=100\times0.5329 = 53.29$ g.

Step2: Calculate moles of oxygen

The molar - mass of oxygen ($O$) is $M_O = 16$ g/mol. Using the formula $n=\frac{m}{M}$, where $n$ is the number of moles, $m$ is the mass and $M$ is the molar - mass. So, $n_O=\frac{53.29}{16}\approx3.33$ mol.

Answer:

B. 3.33