posted by Tim .
If 4.57 grams of AgBr was isolated in a gravimetric analysis of a 9.30 gram sample, what is the % Br- by weight in the samples?
please provide steps to get to answer
What is the mass of Br?
moles AgBr = 4.57 grams AgBr x (1 mol AgBr/molar mass AgBr).
There is 1 mole Br in 1 mole AgBr; therefore, you now have moles Br.
How many grams Br do you have?
grams Br = moles Br x atomic mass Br
What percent is that of the original sample?
%Br = (grams Br/mass sample)*100 = ??