Problem: 12.-16.In a reaction of a flare, 5 grams of magnesium were reacted.12. How many moles of magnesium were reacted? (a) 0.4 (b) 0.8 (c) 1.6 (d) 0.2 (e) 0.1 13. How many moles of O2 were needed for the reaction? (a) 0.4 (b) 0.8 (c) 1.6 (d) 0.2 (e) 0.1 14. How many grains of O2 were needed for the reaction? (a) 3.2 (b) 6.4 (c) 12.8 (d) 1.6 15. How many moles of MgO were produced in the reaction? (a) 0.4 (b) 0.8 (c) 1.6 (d) 0.2 (e) 0.1 16. How many grams of MgO were produced in the reaction? (a) 8.0 (b) 5.0 (c) 1.6 (d) 2.5

FREE Expert Solution

Reaction:

2 Mg +  O2 → 2 MgO


Part A. Calculate moles of magnesium 


5.0 g Mg(1 mol Mg24.31 g Mg)=0.2 mol Mg


Answer: (d) 0.2 



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Problem Details

12.-16.In a reaction of a flare, 5 grams of magnesium were reacted.

12. How many moles of magnesium were reacted? (a) 0.4 (b) 0.8 (c) 1.6 (d) 0.2 (e) 0.1 

13. How many moles of O2 were needed for the reaction? (a) 0.4 (b) 0.8 (c) 1.6 (d) 0.2 (e) 0.1 

14. How many grains of O2 were needed for the reaction? (a) 3.2 (b) 6.4 (c) 12.8 (d) 1.6 

15. How many moles of MgO were produced in the reaction? (a) 0.4 (b) 0.8 (c) 1.6 (d) 0.2 (e) 0.1 

16. How many grams of MgO were produced in the reaction? (a) 8.0 (b) 5.0 (c) 1.6 (d) 2.5

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