Question

2c. how many moles of oxygen gas (o₂) are needed to react with 5 moles of hydrogen gas (h₂)?
2 h₂ + 1 o₂ → 2 h₂o
(2 points)
chart and options as shown

Explanation:

Step1: Find mole ratio of H₂ to O₂

From reaction: $\frac{1\ \text{mol}\ O_2}{2\ \text{mol}\ H_2}$

Step2: Calculate moles of O₂

$5\ \text{mol}\ H_2 \times \frac{1\ \text{mol}\ O_2}{2\ \text{mol}\ H_2} = 2.5\ \text{mol}\ O_2$

Answer:

2.5 mol O₂