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One volume of hydrogen combines with sul...

One volume of hydrogen combines with sulphur to produce one volume of a gas (A). If the vapour density of (A) be 17. what is its molecular formula? The volumes have been measured under same temperature and pressure.

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Hydrogen `rarr` A
1 vol 1 vol
n molecules n molecules
1 molecule 1 molecule
2 atoms 1 molecule.
So, the formula of `A=H_(2)S_(x+)` where x is the number of sulphur atoms.
Mol. Mass of `A=2xx1+x xx 32=2V D=2xx17=34`.
or `2+32x=34` or `x=1`
Hence, the molecule formual of A is `H_(2)S`.
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