Question

0.243 g of magnesium on burning with oxygen produce 0.4030 g of magnesium oxide ​

Answer 1

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Experiment 1:

Weight of Magnesium oxide =0.4030 gm

Weight of Magnesium =0.2430 gm.

Weight of oxygen=0.4030–0.2430=0.16 gm

Ratio of Magnesium: oxygen =0.2430:0.16=1.552:1

Experiment 2:

Weight of Magnesium oxide=0.3020

Weight of Magnesium =0.1820

Weight of oxygen =0.3020–0.1820=0.12

Ratio of magnesium: oxygen=0.1820:0.12=1.552:1

In both experiments the ratio of magnesium: oxygen is same (1.518:1) Hence, it illustrates the law of definite proportions.

Answer 2

Answer:

Amount of Magnesium burnt = 0.243 g

Amount of Magnesium Oxide produced=0.4030 g

Amount of Oxygen used = 0.4030 - 0.243

= 0.16 g

Explanation:

Only used "Conservation of Mass" law