Question

the chemical formula for potassium iodide is ki.
a chemist determined by measurements that 0.0100 moles of potassium iodide participate in a chemical reaction. calculate the mass of potassium iodide that participates.
round your answer to 3 significant digits.

Explanation:

Step1: Find molar mass of KI

Molar mass of K (potassium) is $39.10\ \text{g/mol}$, molar mass of I (iodine) is $126.90\ \text{g/mol}$. So molar mass of KI is $39.10 + 126.90 = 166.00\ \text{g/mol}$.

Step2: Use mass = moles × molar mass

Given moles = $0.0100\ \text{mol}$, molar mass = $166.00\ \text{g/mol}$. So mass = $0.0100\ \text{mol} \times 166.00\ \text{g/mol} = 1.66\ \text{g}$.

Answer:

$1.66\ \text{g}$