Arrange the following in order of increasing mass
(i) `3.0115xx10^(23)` molecules of white phosphorus
(ii) 10 mole of `H_(2)` gas
(iii) 1 g molecule of anhydrous `Na_(2)CO_(3)`
(iv) `33.6 L` of `CO_(2)` gas at STP

Options

A. (a)`iilt iltIvlt iii`
B. (b)`iiigt ivgt igt ii`
C. (c )`ilt iilt ivlt iii`
D. (d)`ilt ivlt iiilt ii`

Answer

a

Explanation

At. Wt. of `P=31` and atomicity of `P` in while `P` is `4 Mol`. Wt. of white `P=31xx4=124`
`:. 6.023xx10^(23)` molecules of white `P` weight `124 g`
`:. 3.0115xx10^(23)` molecules of white `P` weight `124/6.023xx3.015`
`=62 g`
(ii) Wt. of 1 mole of `H_(2) gas =2 g`
Wt. of 10 moles of `H_(2) gas =2xx10=20 g`
(iii) `1 g` molecule of anhydrous `Na_(2)CO_(3)` = Mol wt. of `Na_(2)CO_(3)` in `g=106 g`
(iv) At STP 22.4 L `CO_(2)` weight `44 g`
`:. 33.6 L CO_(2)` weighs `44/22.4xx33.6 g`
`66 g`
So, the correct choric
`ilt iilt ivlt iii`