Percent Yield and Purity

Usually when calculating for the % yield, you can discover three things; the % of the product actually being used; the amount of the product obtained and the product expected. Basically it is possible to get the whole product through this equation:

% yield = grams of actual product recovered......     x   100%

grams of product expected from stoich     

step 1: MAKE SURE IT'S BALANCED

step 2: find the the amount in grams that are in the element you are trying to find from the given amount of another element or compound (for example: Br in grams from HBrO3). Either way you'll need to convert into moles, then compare moles and then convert back into grams to get the desired answer of the element in grams.

step 3: now simply follow the equation: used the obtained given amount (the obtained Br) and divide it by your results from the expected amount (step 2; in this case, expected Br). finish by multiplying by 100%.

Note: wrtie "% Yield" on your answer. A written answer would sound like " of every 100g there is -so 'n so amount- in grams of the product actually formed."

Say you get a question where they only give you the percent that's used and only grams of a compound.

You still have to find the expected amount from the resulted product (or compound; which is still the example of Br from HBrO3). Next would be simple algebra to find the obtained amount.

Percent Purity

We need to find the % purity in order to calculate how much of the product will form, which is how much is actually able to react. ("the ratio of mass of a pure substance to mass of impure substance expressed in a percent.") % purity has a similar equaiton:

% purity = Mass of pure substance        x   100%

Mass os impure substance