Question

In an experiment 1.75g of copper on heating gives 2.19g of copper oxide while in

another experiment ,1.135g of copper on heating gives 1.430 g copper oxide , show that

these data confirm the law of definite proportions ?​

Answer 1

❖ Law of definite proportions : The ratio of the masses of elements in any compound is constant regardless of its source or its preparation.

In first experiment,

2.19g of copper oxide gave 1.75g of copper.

• Mass of copper oxide = 2.19g

• Mass of copper = 1.75g

• Mass of oxygen = 2.19-1.75 = 0.44g

Ratio of masses of copper and oxygen,

• 1.75/0.44 = 3.9

In second experiment,

1.430g of copper oxide gave 1.135g of copper$.$

• Mass of copper oxide = 1.430g

• Mass of copper = 1.135g

• Mass of oxygen = 1.430-1.135 = 0.295g

Ratio of masses of copper and oxygen,

• 1.132/0.295 = 3.9

The same ratio confirms that these experiments clarify Law of definite proportions.

Answer 2

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