if antiseptic hydrogen peroxide is 3% H2O2 by mass, approximately how many moles of H2O2 are present in each gram of antiseptic solution? you can assume the solution has the same density as water. show your calculations.

Answer 1

I suppose that is 3%w/w but with the density of 1.00 g/mL, then it is the same as 3% w/v which means 3g H2O2/100 mL and we want to know moles H2O2 in 1 mL.
moles = grams/molar mass. Convert 3g H2O2 to moles and divide by 100 to find the amount in 1 mL.