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1. Magnesium reacts with oxygen to form magnesium oxide

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1. Magnesium reacts with oxygen to form magnesium oxide and has the following balanced chemical equation: 2 Mg +

O2–> 2 MgO.

How many mole(s) of MgO are produced when 5 mole O2reacts completely?

a. 20 mole

b. 4 mole 

c. 10 mole

d. 5 mole 

e. 2.5 mole 

2. Sodium reacts with oxygen to form sodium oxide and has the following balanced chemical equation: 4 Na + O2 –> 2 Na2O. 
How many mole(s) of oxygen gas (O2) are needed to react with 8.0 moles of Na?

a. 1.0 mole

b. 3.0 moles

c. 6.0 moles

d. 2.0 moles

e. 4.0 moles

 
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