The % yield is calculated as follows
% yield = actual yield/ theoretical yield x100
theoretical yield = theoretical moles x molar mass
= 0.700 mole x 101.96 g/mol = 71.372 grams
actual mass = actual moles x molar mass
= 0.329 mol x 101.96 = 33.545 grams
% yield is therefore= 33.545/71.372 x100= 47%