## 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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