How many moles are contained in 0.873 g of KOH?
Chemistry · High School · Mon Jan 18 2021
Answered on
To determine the number of moles in a given mass of a substance, you can use the formula:
Number of moles = Mass of substance (g) / Molar mass of substance (g/mol)
First, you need the molar mass of potassium hydroxide (KOH). This is found by adding the atomic masses of potassium (K), oxygen (O), and hydrogen (H):
Molar mass of KOH = Atomic mass of K + Atomic mass of O + Atomic mass of H ≈ 39.10 g/mol (for K) + 16.00 g/mol (for O) + 1.01 g/mol (for H) ≈ 39.10 + 16.00 + 1.01 ≈ 56.11 g/mol
Now you can calculate the moles of KOH:
Number of moles = 0.873 g / 56.11 g/mol ≈ 0.01556 mol
So, 0.873 g of KOH contain approximately 0.01556 moles.