Answers
(7) mass of solute=800g-780g=20g
mass%of the solute in this solution=(20g/800g)*100%=2.5%
Hence,2.5%
(8) Assume V1=500ml M1=2.4M M2=1.0M
V2 we need to calculate
Here using equation M1× V1=M2× V2
2.4×500=1.0×V2
=>V2=1200ml
Hence we need 1.2L or 1200mL of water to make a solution of 1.0M.
(9) Colloids
The particles of colloids remain dispersed and do not settle due to gravity.
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