Question

A gas cylinder filled with hydrogen contains 6g of hydrogen gas. The same cylinder can hold 102g of a gas y under the same condition of temperature and pressure. Calculate the a) vapour density and the molecular mass of the gas y

Answer 1

Answer:

According to Avogadro's law

at constant temperature, pressure & volume; number of moles of two gases become equal.

n

1

=n

2

or n

H

2

=n

CO

2

(i) Number of moles in 1kg of H

2

=

2

1000

g=500 moles

Thus, n

CO

2

=n

H

2

=500

(ii) Mass of CO

2

in 500 moles= 500×44=22000g or 22kg

(iii) Number of hydrogen molecule in 500 moles beX

X=500×M

a

molecules

X=500×6.022×10

23

molecules

Thus number of CO

2

molecules in 500 moles of CO

2

will be

X=500×M

a

molecules

X=500×6.022×10

23

molecules .

(iv) The law is Avogadro's Law .