The number of `O_(2)` molecules and its volume at S.T.P in 50.6 g of hydrated sodium carbonate ore:

Options

A. `6.926xx10^(23), 22.4` litre
B. `5.92xx10^(21), 25.76` litre
C. `6.926xx10^(23), 25.76` litre
D. `5.92xx10^(21), 22.4` litre

Answer

C

Explanation

Hydrated sodium carbonate `=Na_(2)CO_(3).10H_(2)O`
Its molecular mass `106+180=286`
`:.` No. of `O_2` molecule `=(50.6)/(286)xx6.02xx10^(23)xx(13)/(2)` molecules `=6.926xx10^(23)` molecules
Volume of `O_2` gas of S.T.P `=(6.926xx10^(23))/(6.02xx10^(23)) xx22.4" litre "= 25.76` litre.