A gas of 250 ml at 20°C and 720 Torrs. What volume would the gas occupy at STP ?

The gas would occupy volume of 221 ml at STP

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

where,

= initial pressure of gas = 720 torr

= final pressure of gas = 760 torr (at STP)

= initial volume of gas = 250 ml

= final volume of gas = ?

= initial temperature of gas =

= final temperature of gas =   (at STP)

Now put all the given values in the above equation, we get:

The gas would occupy volume of 221 ml at STP

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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