Aim: How to do Mass to Mass Calculations. Mass to Mass Calculations.

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Presentation transcript:

Aim: How to do Mass to Mass Calculations

Mass to Mass Calculations

Example 1 2Mg(s) + O 2 (g)  2MgO(s) 12.2 g of magnesium reacts completely with oxygen gas. Calculate the mass of the oxygen consumed during the reaction.

Example 1

Step 3: Convert moles of oxygen to mass of oxygen. Mass = mole * molar mass Mass O 2 = mol * 32.0 g/mol Mass O 2 = 8.03 g

Example 2 How many grams of calcium are needed to react completely with 108 grams of H 2 O in the equation ◦Ca + 2H 2 O  Ca(OH) 2 + H 2

Example 2

Step 3: Convert from moles to mass. Mass = mole * molar mass Mass Ca = 3.00 mol * 40.1 g/mol Mass Ca = 120 g