Question

the chemical formula for potassium bromide is kbr. a chemist determined by measurements that 0.0700 moles of potassium bromide participate in a chemical reaction. calculate the mass of potassium bromide that participates. be sure your answer has the correct number of significant digits.

Explanation:

Step1: Find molar mass of KBr

The molar mass of K (potassium) is approximately 39.10 g/mol and of Br (bromine) is approximately 79.90 g/mol. So, molar mass of KBr, $M = 39.10+79.90=119.00$ g/mol.

Step2: Use mass - mole relationship

The formula is $m = n\times M$, where $n = 0.0700$ moles (amount of KBr) and $M = 119.00$ g/mol. So, $m=0.0700\times119.00 = 8.33$ g.

Answer:

8.33 g