Question

plz answer the two questions

Answer 1

Final Answer : 1) 26.25 g
2) 10%


Steps:
1) Volume of solution = 750mL
Mass by Volume % = 3.5%
=> Mass of Solute / Volume of solution(in mL) *100= 3.5%
=>( Mass of solute /750 )*100= 3.5
=> Mass of solute = 3.5* 30/4 = 26.25 g


2)Volume of Ethanol = 10 mL
Volume of water = 90mL
Volume of solution = 90+10 = 100mL

% Volume of Ethanol = [Volume of Ethanol / Volume of solution ] * 100
= 10/100 * 100 = 10%