IDNStudy.com, ang iyong mapagkukunan para sa malinaw at mabilis na mga sagot. Anuman ang kahirapan ng iyong mga tanong, ang aming komunidad ay may mga sagot na kailangan mo.

What is the volume of water and alcohol in 200mL of 30% solution of ethanol?

Sagot :

% by volume is an expression of concentration that says the volume of solute (alcohol) per unit volume of solution (alcohol + water). 

In this case, your unit of volume is mL so that 25 % v/v of alcohol solution means you have 25 mL of alcohol for every 100 mL of alcohol solution. 

Let x be the volume of alcohol in 200 mL of 25 % v/v alcohol solution, 

25 mL alcohol/100 mL alcohol solution = x mL alcohol/200 mL alcohol solution 

x mL alcohol = (0.25)(200) = 50 mL 

It is very easy!! :D