more on stoichio

Question 1

limiting / excess reagent statement

Answer 1

from the balanced chemical equation, since _ mol of _ reacts with _ mol of _, _ mol of _ reacts completely with _ mol of _. however, there are _ mol of _, hence, _ is the limiting/excess reagent.

Question 2

percentage yield

Answer 2

% yield = actual yield (g) / theoretical yield (g) x 100%

Question 3

percentage purity

Answer 3

% purity = mass of pure substance (g) / mass of substance used in reaction (g) x 100%