I don't know how to do this please help me

I don't know how to do this please help me

It is from the chapter solutions

The sum of 2 numbers is 65. One number is 4 times bigger than the other number what are the numbers.

A chemist needs 4 liters of a 12% acid solution. He has a 10% solution and a 20% solution available to form the mixture. How much of each should be used to form the 12% solution?

How much solution do I need to get 30% of solution of 200 gallons.

What would you expect to see in a beaker containing a solution of the weak electrolyte acetic acid (CH3COOH), and in a separate beaker containing a solution of the strong electrolyte Potassium Chloride...

How much of an alloy that is 30% copper should be mixed with 300 ounces of an alloy that is 70% copper in order to get an alloy that is 50% ?copper?

A chemist has two solutions of HNO3. One has a? 40% concentration and the other has a? 25% concentration. How many liters of each solution must be mixed to obtain 84 liters of a 35?% ?solution...

How many ounces of a 35% alcohol solution must be mixed with 12 ounces of a 40 % alcohol solution to make a 39 % alcohol? solution?

2x-2x-2=192

Completely dry raisins do not absorb water from a solution because.......

please help me I cant figure out this answer I have tried to summit my answer 5 times and its incorrect

250g of water were added to 150g of 30% salt solution. What is the new concentration of the mixture? PLEASE HELP :D

A pharmacist needs to prepare a 1.0% (m/v) silver nitrate solution. The pharmacy has on hand 24 mL of 3.0% (m/v) stock solution of silver nitrate. Explain in a sentence how the more dilute solution can...

2x2 +9x+4=0 find the solutions

#1) 4.555 moles of NaCl is dissolved in 8000 mL of water, calculate the molarity. #2) You have 300 mL of a 1.5 M HCl solution. How many moles of HCl does this solution contain? #3)...

I don't know how to set this up and I am needing help. My professor did not tell me how to do this nor does my book

katy runs a dry cleaning business and needs 6% phosphoric acid solution to remove a stain from a suit. Katy has on hand 14% phosphoric acid solution and a 2% phosphoric acid solution. How many milliliters...

mixtures and solutions

Calculate the vapor pressure of water above a solution made by adding 15.0 g of lactose (C12H22O11) to 100.0 g of water at 338 K. (vapor pressure of pure water at 338 K is 187.5 torr) P...

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