Answer:
There will react 78.2 grams of potassium
Explanation:
Step 1: Data given
Potassium = K
Mass of oxygen = 16.00 grams
Mass of potassium oxide produced = 94.00 grams
Molar mass potassium = 39.1 g/mol
Molar mass Oxygen = 32 g/mol
Molar mass potassium oxide = 94.2 g/mol
Step 2: The balanced equation
4K + O2 → 2K2O
Step 3: Calculate moles O2
Moles O2 = mass O2 / molar mass O2
Moles O2 = 16.00 grams / 32 g/mol
Moles O2 = 0.5 moles
Step 4: Calculate moles K2O
Moles K2O = 94.00 grams / 94.2 g/mol
Moles K2O = 1.00 moles
Step 5: Calculate moles of potassium
For 1 moles of O2 we need 4 moles of K to produce 2 moles of K2O
For 0.5 moles O2 we need 4*0.5 moles = 2.0 moles of potassium
Step 6: Calculate mass of potassium
Mass potassium = 2.0 moles * 39.1 g/mol
Mass potassium = 78.2 grams
There will react 78.2 grams of potassium
