Question

A solution of h2so4 is 10%(wt/wt).find the mass of h2so4 present in 100ml of solution (densities of solution=1.4g/ml)​

Answer 1

Answer:

10 percent by volume of H2SO4 means that 10 ml acid in 100 ml solution

volume of H2SO4= 10ml

Volume of water= 90 ml

Density of solution is 1.4 g/cc

mass of aq solution of H2SO4=volume*density= 1.4*100=140g

Mass of water is= 90*1=90g

Mass of solute i.e. H2SO4= 120-90 = 30g

molality means number of moles of solute present in 1 kg solvent .

Hence molality= number of mole of solute/wt.of solvent in kg

number of mole of solute=30/98=.306

Mass of water is= 90*1=90g=.09kg