[Spacenova]

I have a question. I want to calculate Glyceryl Trinitrate 1 % m/m assay. This is the description of assay:

http://lib.njutcm.edu.cn/yaodian/ep/EP5.0/16_monographs/monographs_d-k/Glyceryl%20trinitrate%20solution.pdf

How I get 60.8 in calculation?

Thank you.

[Babcock_Hall]

It is a forum rule that you must show your attempt first, before we can help you.

[Arkcon]

Even if it weren't a forum rule, how can we discover the answer, from the protocol?  Show us what you did, fill in the calculation with your observed values.  You may even solve it yourself just by looking at it.

[Spacenova]

NaNO3 molar weight : 68.99. I thought as well it is molar weight.

[Arkcon]

So you question really is, in the published expression: A_T x m_S x C / A_R x m_T x 60.8 x 100, where the 60.8 comes from?  That's sort of a fudge factor this sort of compendium use when they simplify the procedure for you.  You can certainly try to figure out how they got the fudge factor, if you feel the need (and have the time,) to learn more.  What does each factor stand for?  How do they all relate?  Do you recognize 60.8 -- is that a MW, or something like that?