The chemical equation below shows the burning of magnesium with oxygen to form magnesium oxide 2Mg + 02 - - > 2MgO the molar mass of O2 is 32.0g/mol. what mass, in grams, of O2, is required to react completely with 4.00 mol of Mg? a. 2.00 b. 64.0 c. 128 d. 256

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Chemistry

Macho

15 March, 18:06

The chemical equation below shows the burning of magnesium with oxygen to form magnesium oxide 2Mg + 02 - - > 2MgO the molar mass of O2 is 32.0g/mol. what mass, in grams, of O2, is required to react completely with 4.00 mol of Mg? a. 2.00 b. 64.0 c. 128 d. 256

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Caitlin Randolph · Answer 1

B.) 2Mg + 02 - - > 2MgO. According to stoichiometry, 2 moles of Mg reacts with 1 mole of O2. Therefore 4 moles of Mg will react with 2 moles of O2. Therefore mass of O2 required = moles of O2 x molar mass of O2 = 2 x 32 = 64 grams.