Question

If you have 99 grams of bromine gas, what volume do you have

Answer 1

99 grams of bromine gas will give us 27.75L

Explanation:

What to find? Volume of bromine

Given parameters

• The mass of bromine = 99 grams

,

• Molar mass of bromine = 79.904 g/mol

Firstly, we need to find the mole of bromine

`\begin{gathered} \text{Mole = }\frac{\text{ reacting mass}}{\text{molar mass}} \\ \text{Mole = }(99)/(79.904) \\ \text{Mole = 1.239 moles} \end{gathered}`

Note that, 1 mole = 22.4L at STP

`\begin{gathered} 1\text{ mole }\rightarrow\text{ 22.4L} \\ 1.239\text{ moles }\rightarrow\text{ xL} \\ \text{Cross multiply} \\ xL\cdot\text{ 1 mole = 22.4L }\cdot\text{ 1.239 moles} \\ x\text{ = }\frac{22.4L\cdot\text{ 1.239 moles}}{1\text{ mole}} \\ x\text{ = 27.75L} \end{gathered}`

Hence, 99 grams of bromine gas will give us 27.75L