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

Options

A. `6.926 xx 10 ^(23), 22.4 ` litre
B. `5. 92 xx 10 ^(21) ,25.76` litre
C. `6.926 xx 10 ^(23), 25.76` litre
D. `5.92 xx 10 ^(21) , 22.4 ` litre

Answer

C

Explanation

Hydrted Sodium Carbonate `= Na _(2) CO _(3) . 10 H _(2) O `
Its molecular mass `106 + 180 = 286`
`therefore` No. of `O _(2)` molecule `= ( 50. 6)/( 286) xx 6. 02 xx 10 ^(23) xx (13)/(2)` molecules `= 6. 926 xx 10 ^(23)` molecules
Volume of `O _(2)` gas of `S.T.P = ( 6. 9 26 xx 10 ^(23))/( 6 . 02 xx 10 ^23) xx 22. 4 `litre = `25. 76` litre