Question

how do i calculate a weight/vol % from a molarity given the density?
Molarity is 0.0303 M density = 1.52 g/mL, molar mass is 41.99 g/mol.

Answer 1

also we had 0.3885 grams dissolved into a 100 mL vol flask... hmmm

Answer 2

The second one is easier than the first.
wt/vol% = (grams solute/100 ml solution) = 0.3885 g/100 mL = 0.3885 % w/v

For #1, you have a molarity of 0.0303. That means you have 0.0303 mols/L solution.
0.0303 x 41.99 = about 1.3 g/L
Approx (1.3/1000)&100 = ?% w/v

Answer 3

thank you :)