Question

4al + 3o₂ → 2al₂o₃
9.30 mol al | 3 mol o₂ / 4 mol al | ? / ? = ? g o₂
what conversion should be used in the green boxes?
32.0 g o₂ / 1 mol o₂
1 mol o₂ / 32.0 g o₂
16.0 g o₂ / 1 mol o₂

Explanation:

Step1: Determine the molar mass of \(O_2\)

The molar mass of \(O\) is \(16.0\ g/mol\). For \(O_2\), \(M = 2\times16.0\ g/mol=32.0\ g/mol\).

Step2: Analyze the unit - conversion requirement

We need to convert moles of \(O_2\) to grams of \(O_2\). The conversion factor for converting moles to grams is \(\frac{\text{mass (g)}}{\text{moles}}\).

Answer:

\(\frac{32.0\ g\ O_2}{1\ mol\ O_2}\)