Formulas, Yield & Atom Economy Flashcards
Empirical formula
Simplest whole number ratio of atoms in each element in a compound
What is theoretical yield?
Mass of product that should be formed in chemical reaction
Equation for percentage yield
Percentage yield = (actual mass/theoretical mass) x 100
Equation for % atom economy
% Atom economy = (mass of desired products/total masses of all reactants) x 100
Why are processes with high atom economies good?
Less waste - better for environment
Efficient use of raw materials - sustainable
Less expensive
Why might you not get the expected amount of product? % yield
Reversible reaction
Some reactants may react in other reactions
Some product lost when separated from reaction mixture
Equation for % error
% error = (uncertainty value/ measurement) x 100
Mostly x2
