t3- quantitative chemistry Flashcards
what is the law of the conservation of mass
no atoms are lost/made during a chemical reaction so the mass of the products=mass of reactants
what is relative atomic mass
average mass of atoms in an element
what is relative formula mass
sum of all the relative atomic masses of all atoms in a formula
what is avogadro’s constant
6.02 x 10^23
what is the formula for Mr
Mr=mass/moles
what is a limiting reactant
the reactant that is completely used up
what are the 2 formulas for concentration
conc=mol/vol
conc=mass/vol
what is the molar volume for gas at room temp and pressure
1 mol of gas= 24dm^3
why is it not always possible to obtain the theoretical amount of product in a chemical reaction
reaction may not go to completion because it’s reversible
some product may be lost when it’s separated from reaction mixture
side reactions may occur
how to calculate %yield
%yield= actual mass of product/maximum theoretical mass of product x 100
what is atom economy
the amount of starting materials that end up as useful products
