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L. 2.0 g of a metal burnt in oxygen gave 3.2 g of its oxide. 1.42 g of the same metal heated in steam gave 2.27 of its oxide. Which law is verified by these data ?

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In first  reaction :

3.2 g of metal oxide contains 2g metal

$$\therefore$$ % of metal in metal oxide is  $${2\over 3.2}\times 100=62.5 \%$$

and % of oxygen in metal oxide is  $${1.2\over 3.2}\times 100 =37.5\%$$

In second reaction :

2.27 g of metal oxide contains 1.42 g of metal

$$\therefore$$ % of metal in metal oxide is $${1.42\over 2.27}\times 100=62.5 \%$$

and % of oxygen in metal oxide is $${0.85\over 2.27}\times 100=37.5\%$$

the percentage of metal and oxygen in both reaction is nearly same ,

according to law of definite proportion  "a given compund always conatins exactly the same proportion of elements by  weight"

, hence  The law of definite proportion is verified by the given data

by Expert (10.7k points)