Question

3.2g of oxygen is ____ moles
a 0.1
b 1
c 10
d 20
question 2 of 4

Explanation:

Step1: Recall molar - mass formula

The formula for calculating the number of moles $n=\frac{m}{M}$, where $m$ is the mass and $M$ is the molar mass. The molar mass of oxygen ($O$) is approximately $16g/mol$.

Step2: Calculate the number of moles

Given $m = 3.2g$ and $M=16g/mol$, then $n=\frac{3.2g}{16g/mol}=0.2mol$. But if we assume the oxygen is $O_2$ (which is more common in chemical contexts), the molar mass of $O_2$ is $M = 32g/mol$. Using $n=\frac{m}{M}$ with $m = 3.2g$ and $M = 32g/mol$, we have $n=\frac{3.2}{32}=0.1mol$.

Answer:

A. 0.1