Considering the definition of percentage by mass, the sample of pure lithium nitrate contains 7.99% lithium by mass.
<h3>Definition of percentage by mass</h3>
The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

<h3>This case</h3>
Because percent by mass indicates the ratio of solute to solution based on mass, if the sample has twice the mass of the first sample, the ratio remains constant.
So the percentage by mass is the same.
That is, the sample of pure lithium nitrate contains 7.99% lithium by mass.
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Answer:
The answer is "9"
Explanation:
In the given-question, the attachment file, which is "graph" is missing. so, in this question, firstly we add the file and then provide the solution:
please find the attachment of the image file.
Solution:
In the given graph by canceling, the out ends for getting the middle median that is equal to 2, that's why its value is equal to "9".
Answer:
B. They were regarded as the property of the noble whose fields they worked in.
And C. They made up more than three-quarters of the population.
Explanation:
I took the test, let me know if it's correct :)
Ok, so first you have to count le 15% off. It means you pay 85% of the price
0,85•65= 55,25$
Second, you take the 10$ off
55,25-10=45,25$
Third, you have know what percentage of the original price you paid
45,25 divided by 65 =0,6962
So you actually paid 69,62% of the original price