Question

How many moles are in 28 grams of O2?

Answer 1

Answer:

0.88 mol O₂

Explanation:

Step 1: Find molar mass

Oxygen (O) - 16.00 g/mol

O₂ - 32.00 g/mol

Step 2: Use Dimensional Analysis

$28 \hspace{3} g \hspace{3} O_2(\frac{1 \hspace{3} mol \hspace{3} O_2}{32.00 \hspace{3} g \hspace{3} O_2} )$ = 0.875 mol O₂

Step 3: Simplify

We have 2 sig figs.

0.875 mol O₂ ≈ 0.88 mol O₂