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%

## Answer This Question

## Related Questions

- Math - A 75% alcohol concentration mixture of water and alcohol and was made by ...
- Math - 180 ml of a mixture of water and alcohol with 90% alcohol concentration ...
- Math Help needed quickly - In a mixture of alcohol and water the concentration ...
- Maths - How much pure alcohol has to be added to 400ml of a solution containing ...
- algebra - A certain car's cooling system has an 8-qt capacity and is filled with...
- math - An alcohol solution consists of 6 gallons of pure water and x gallons of ...
- math - An alcohol solution consists of 6 gallons of pure water and x gallons of ...
- math - in the lab, tom has two solutions that contain alcohol and is mixing them...
- math / algebra - n the lab, Bob has two solutions that contain alcohol and is ...
- chemistry - You need 715 mL of a 45% alcohol solution. On hand, you have a 55% ...

More Related Questions