Question

1. you are given 15.3 grams of so₂, how many moles is this?

Explanation:

Step1: Calculate molar mass of \(SO_2\)

Molar mass of \(S = 32.07\ g/mol\), molar mass of \(O=16.00\ g/mol\).
Molar mass of \(SO_2\), \(M=(32.07 + 2\times16.00)\ g/mol=64.07\ g/mol\)

Step2: Calculate number of moles

Use the formula \(n=\frac{m}{M}\), where \(m = 15.3\ g\) (mass of \(SO_2\)) and \(M = 64.07\ g/mol\) (molar mass of \(SO_2\))
\(n=\frac{15.3\ g}{64.07\ g/mol}\approx0.239\ mol\)

Answer:

\(0.239\ mol\)