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NOTES: Using a reaction to find moles or grams

NOTES: Using a reaction to find moles or grams. If you start with 2 moles of H 2 O, how many grams of O 2 will you end with? 2H 2 O  2H 2 + O 2. If you start with 2 moles of Na 2 O, how many grams of Na will you end with? (Na = 23 g/mol)

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NOTES: Using a reaction to find moles or grams

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  1. NOTES: Using a reaction to find moles or grams If you start with 2 moles of H2O, how many grams of O2 will you end with? 2H2O  2H2 + O2

  2. If you start with 2 moles of Na2O, how many grams of Na will you end with? (Na = 23 g/mol) 2Na2O  4Na + O2

  3. If you start with 50 grams of MgS, how many grams of Mg will you end with? (The molar mass of MgS is 56.4 g/mol.) Mg = 24.3 g/mol 2MgS  2Mg + S2

  4. If you start with 50 grams of Ga, how many grams of GaBr3 will you end with? (The molar mass of Ga is 69.7 g/mol.) GaBr3 = 309.7 g/mol 2Ga + 3Br2 2GaBr3

  5. If you start with 63 grams of S, how many grams of SO3 will you end with? (The molar mass of S is 32.1 g/mol.) SO3 = 80.1 g/mol 2S + 3O2  2SO3

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