Question

A sample of pure lithium contains 7.99% lithium by mass. What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample ?

Answer 1

The given molecule is lithium nitrate LiNO3

% Li in a pure sample of LiNO3 of a certain mass = 7.99%

As per the law of definite proportion a given compound will have the same elements that combine together in a fixed ratio by mass.

Therefore, irrespective of the amount of LiNO3 taken, the percentage of Li will remain the same. i.e. Li will be 7.99% even if the mass of the sample of LiNO3 is doubled.

Answer 2

The percentage of lithium in pure lithium nitrate will be same 7.99 %

What is lithium nitrate?

Lithium nitrate is $\bold{LiNO_3}$ an inorganic compound. It is a lithium salt of nitric acid.

Given,

The percentage of Li is 7.99%

By the law of definite proportion:

A compound will have the same elements that combine in a fixed ratio by mass.

Thus, the percentage of Li will remain constant regardless of the amount of LiNO3 consumed. That is, even if the mass of the sample of LiNO3 is doubled, Li will be 7.99 percent.

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