Homework Help: Math please

Posted by Carllll needs help on Friday, April 13, 2007 at 6:02pm.

A 75% alcohol concentration mixture of water and alcohol was made by mixing 30ml of pure alcohol with 150 ml of original mixture of water and alcohol. what was the alcohol concentration of the orignal mixture

The amount of water has not changed.

Since the final solution is 180 ml and is 75% alcohol, 25% or 45 ml must be water.

So that 45 ml of water must have been in the original 150 ml of the mixture which means 105 ml must have been alcohol

then the alcohol concentration of the original mixture was 105/150 or 70%

No one has answered this question yet.

Answer this Question

Related Questions

Math - 180 ml of a mixture of water and alcohol with 90% alcohol concentration ...
math - in the lab, tom has two solutions that contain alcohol and is mixing them...
physics - the mass density of a mixture of ethyl alcohol and water is 950kg/m^3...
Math - A large tank contains 400-kg mixture of water and alcohol. The mixture is...
MATH - Pewee adds two liters of pure alcohol to a 30% solution of alcohol in ...
chemistry - If im trying to separate alcohol from water by distillation, is it ...
physics - . Ethyl alcohol has been added to 160 mL of water in a container that ...
Chemistry - Please help!! - I did a lab for Organic Chemistry We did a simple ...
phyics - Ethyl alcohol has been added to 190 {\rm mL} of water in a container ...
MATH - Isopropyl alcohol, C3H8O, is used in rubbing alcohol mixture. Alcohol on ...

For Further Reading

First Name:
School Subject:
Answer: