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| 1. |
Calculate the molar mass of water if it contains 50% heavy water (D_(2)O). |
| Answer» Solution :As water contains `50%D_(2)O`, this means that it contains `(1)/(2)` MOLE of `H_(2)O` and `(1)/(2)` mole of `D_(2)O`. Mass of `(1)/(2)" mole of "H_(2)O=(1)/(2)xx18="9 g. Mass of "(1)/(2)" mole of "(1)/(2)" mole of "D_(2)O=(1)/(2)(2xx2+16)="10 g. Hecne, molar mass of the GIVNE sample of water"=9+10="19 g mol"^(-1)`. | |