Question

1. antimony is burned in oxygen to form antimony oxide.

4 sb + 3 o₂→ 2sb₂o₃
how many moles of sb₂o₃ will be formed when you have 20.0 moles of oxygen gas?
options: 13.3 moles, 40.8 moles, 15.5 moles, 10.0 moles

Explanation:

Step1: Identify mole ratio

From the equation \(4\ Sb + 3\ O_2
ightarrow 2\ Sb_2O_3\), the mole ratio of \(O_2\) to \(Sb_2O_3\) is \(3:2\).

Step2: Set up proportion

Let \(x\) be moles of \(Sb_2O_3\). Then \(\frac{3\ mol\ O_2}{2\ mol\ Sb_2O_3}=\frac{20.0\ mol\ O_2}{x\ mol\ Sb_2O_3}\).

Step3: Solve for \(x\)

Cross - multiply: \(3x = 2\times20.0\). Then \(x=\frac{2\times20.0}{3}=\frac{40.0}{3}\approx13.3\) moles.

Answer:

13.3 moles (corresponding to the option "13.3 moles")