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

Answer:

A mole is equal to the relative molecular mass of a gas. As given, the number of moles of gas X and hydrogen are same in the two flasks.

Therefore no. of moles in 2g of hydrogen gas = 1

No. of moles in 1.01g of hydrogen gas = 1/2

Now the weight of gas X that contains 1/2 moles = 16.2g

Weight of gas X that contains 1mole =

1/2

16.2

= 32g

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