Choose the incorrect statement: The number of atoms in 1 g of helium is `1.506 xx 10^(22)`, The mass of 1 molecule.of CO is `4.65 xx 10^(-23) g` , The volume at STP occupied by 240g of `S_(2)` is 22.4 litre, The volume at STP occupied by 240g of `SO_(2)` is 84 litre

Options

A. The number of atoms in 1 g of helium is `1.506 xx 10^(22)`
B. The mass of 1 molecule.of CO is `4.65 xx 10^(-23) g`
C. The volume at STP occupied by:240g of `S_(2)` is 22.4 litre
D. The volume at STP occupied by 240g of `SO_(2)` is 84 litre

Answer

B

Explanation

4 gof Helium contains `6. 02 xx 10^(23)` atoms
1 g of Helium contains `= ( 6. 02 xx 10 ^(23))/( 4) = 1. 506 xx 10^(23)` atoms
Gram molecular weight of `CO = 12 + 16 = 28 g`
`6. 0 23 xx 10 ^(23)` molecules f CO weight 28 g
1 molecule of CO weights `= (28)/( 6. 02 xx 10 ^(23)) = 4. 65 xx 10 ^(-23) g`
Molecular weight of `SO _(2) = 32 + 2 xx 16 = 64`
`64 gm `of `SO _(2)` ocupies `22.4` litre at STP
240 gm of `SO_(2)` occupies `= (22.4)/(64) xx 240 = 84` litre at STP