Answer to Question #253353 in General Chemistry for sion

Question

Rubbing alcohol, C3H7OH, is sold as a 70.0% v/v solution for external use only. What volume of pure rubbing alcohol is present in a 500-mL bottle

Answer 1

Volume/volume percent = x 100 %

Volume of solute

=volume of solute Volume of solution Volume/volume % x volume of solution 100%

{70% x 500 m L}÷100%

= 350 m L

350 m L of C3H7OH alcohol is used to make 500 m L of 70% (v/v) rubbing alcohol.