Question

Molar mass of normal water as compared to heavy water is :-

(i) 10% less
(ii) 10% more
(iii) 2% less
(iv) 2% more

Give full solution along with the correct option !!!! ​

Answer 1

Answer:

here is your answer and please support me ....

Answer 2

To Find :-

Molar mass of normal water as compared to heavy water is:-

Solution :-

At First , Let Starts with the molecular formula of Normal Water and Heavy Water i.e

For Normal Water :- H2O

For Heavy Water :- D2O

Here a question arises. ,if both are water then why the formula of Heavy water is different , Why ?

=> It is because we are studying about Isotopes from class 9th specially that of Hydrogen , 3 in counting i.e Protium ( A = 1 ) , Deuterium ( A = 2 ) , Tritium ( A = 3 ) .

So , in normal water There is protium present. But in heavy water protium is absent and there is present Deuterium ( D2 ) . That's why formula for heavy water is different .

Now , another question arises i.e If both protium and Deuterium are used in water . So , why Not Tritium ?

=> It has a special reason , That we will first study in Class 11th , Tritium as compared to Protium and Deuterium is very high radioactive . And radioactive substances can harm human body .

Note that tritium releases Negatively charged beta rays ( B^- ) .

Now , I hope you will understand .Let us back on the main question .

As we know that Molar mass of H2O = 2 × 1 + 16 × 1 = 2 + 16 = 18u

Molar mass of D2O = 2 × 2 + 1 × 16 = 4 + 16 = 20u

Difference between masses = 20 - 18 = 2u

Now , We have to compare mass of normal water to heavy water . So , when we convert the required quantity in percent the net quantity that we should take is mass of D2O i.e 20u

Therefore , Molar mass of normal water as compared to heavy water is :-

$\frac{2}{20} \times 100$

$\frac{1}{10} \times 100$

$\frac{100}{10}$

10% . Hence option ( ii ) 10% more is the required answer .

I hope you will read my full answer .