Question

100 cm3 of fresh water of density 1,000 kgm-3 is mixed with 100 cm3 of sea water of density 1030 kgm-3 . Calculate the density of the mixture?

Answer 1

Hey Here is your answer...

Mass = density × volume  

Mass of fresh water = 1,000 × 0.0001 = 0.1 kg

Mass of sea water = 1030 × 0.0001 = 0.103 kg

Mass of mixture = 0.1 + 0.103 = 0.203 kg

Volume of mixture = 100 + 100 = 200 cm3

= 0.0002 m3

Therefore density = mass / volume = 0.203 / 0.0002 =1,015 kg/m3

Answer 2

100cm3=0.0001 m^3 (always convert everything into SI units)

that 's the volume.

mass=volume*density

mass of freshwater=0.0001*1000=0.1 kg

mass of seawater=0.0001*1030=0.103 kg

total mass: add these two quantities:0.203kg

total volume: 0.0001 +0.0001 =0.0002

density=mass/volume=0.203/0.0002=1015kgm-3

that's your answer