Question

Two flask of equal volumes are evacuated. One is filled with gas A and other with gas B at the same temperature and pressure. The weight of gas B was found to be 0.8 gm while the weight of gas A is found to be 1.4 gm. The weight of one molecule of B is - (1) 1.4 times as that of A (2) 0.4 times as that of A (3) 0.57 times as that of A (4) 0.8 times as that of A

Answer 1

The weight of gas b is is 0.57 times of gas A

Option 3

Explanation:

• according to the gas laws equal volumes of gases under evil conditions of temperature and pressure contains equal number of molecules.

• Hence the number of molecules of gas a and gas b will be equal. hence the difference in the weight is caused due to the change in the molecular weight of the two substances. The weight of gas is lesser than the weight of gas a. The ratio of this is equal to 0.8/1.4 = 8/14  =0.57

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