Calculating molecules of KOH given its mass

A sample of potassium hydroxide contains 2.501x10 -21  g. This mass corresponds to how many molecules of potassium hydroxide? Strategy grams...

A sample of potassium hydroxide contains 2.501x10-21 g. This mass corresponds to how many molecules of potassium hydroxide?

Strategy

grams of KOH ➡ moles of KOH ➡ molecules of KOH

Step-by-Step

1. Convert grams of KOH to moles using its molar mass (56.1056 g/mol)
2. Convert moles of KOH to molecules using the relationship between moles and the avogadro's number (1 mol = 6.022x1023 molecules)