[cronosking]

How can I calculate percent by mass of a x subtance???

Thanks!!!

[DevaDevil]

I assume you mean mass% of a substance in a mixed compound.

That is quite straightforward: {mass of the substance / mass of the compound} * 100%


If this is not what you mean, you need to formulate your question more clearly

[cronosking]

my bad

i am doing a acid-base titration lab report and the question says "use your data from this experiment to calculate the % by mass of ethanoic acid present in commertial, undiluted vinegar."

We used KHP, NaOH, and vinegar, found the nomality for NaOH and vinegar, got the mass of KHP, etc...

[Yggdrasil]

% mass is basically a measure of concentration.  It is the mass of your compound per 100g of solution (so for example, 1g of acetic acid in 100g of solution is a 1% solution).  For dilute aqueous solutions, this is approximately equal to the weight of your compound per 100mL of solution (since for pure water 1g = 1mL).

[cronosking]

got it thanks