Interpretation: The amount of magnesium and oxygen that react to form 20.0 g of magnesium oxide should be determined.
Concept Introduction: In a chemical change, the
Answer to Problem 14STP
The amount of magnesium and oxygen react to form 20.0 g of magnesium oxide 12.0 g and 8.0 g respectively.
Explanation of Solution
Mass of Magnesium (g) | Mass of Oxygen (g) | Mass of magnesium oxide (g) |
5 | 3.30 | 8.3 |
6.5 | 4.30 | 10.8 |
13.6 | 9.00 | 22.60 |
19.00 | 12.50 | 31.5 |
According to the law of conservation of mass, mass is conserved in any chemical or physical change. The mass of reactants is always equal to the mass of products during any
On plotting the mass of magnesium on the x-axis and mass of magnesium oxide on the y-axis, the plot obtained is:
In order to determine the amount of magnesium required to form 20.0 g of magnesium oxide, the lines are drawn like this:
Thus, the amount of magnesium required to form 20.0 g of magnesium oxide is 12 g.
The amount of oxygen is calculated using the law of conservation of mass:
Thus, the amount of oxygen required to form 20.0 g of magnesium oxide is 8 g.
Chapter 2 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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