Question

2.75 grams of Potassium represent how many grams of Potassium?Group of answer choices39.10 grams107.5 grams14.22 grams215 grams

Answer 1

Answer: Option B , 107.52 grams

Solutions :

We are given

• mass of potassium = 2.75 g

,

• Recall that 1 mole of potassium = 39.0983 grams

So , 2.75 g will represent

`\begin{gathered} If\text{ 1 mole K : 39.0983 grams } \\ \text{then 2.75 mol : x } \\ \therefore\text{ x grams = (2.75 moleK }\cdot\text{ 39.0983 g) / 1 mole K } \\ \text{ = 107.52 grams } \end{gathered}`

This means that 2.75 moles of Potassium represent 107.52 grams of potassium.