Chemistry - Calculations - Concentration, mass of solute, volume of solution?

Posted on 2016-04-13 18:51:00 in Chemistry by JHON MORIN

Hello, I am really stuck, I have about 60 questions to answer, over a few different areas, I am hoping to get an idea of how to do them.. 

Calculate the concentration of the following solutions 

0.500 L of a solution containing 2.80 moles of sodium hydroxide 
1.20 L of a solution containing 0.336 moles of potassium nitrate 

What mass of solute is present in each of the following solutions? 

500 mL of a 2.80 mol/L solution of magnesium chloride (MgCl2) 
35.0 mL of a 5.50 mol/L solution of potassium hydroxide (KOH). 

What volume of solution contains the following masses of solute? 

29.0 g of ethanol (C2H6O) in a 0.220 mol/L solution 
15.4 g of sucrose (C12H22O11) in a 1.33 mol/L solution. 

What will be the concentration of the diluted solution in each of the following cases? 

10.0 mL of a 1.00 mol/L sodium chloride solution is made up to 100.0 mL with water. 
28.0 mL of 3.2 mol/L KNO3 solution is made up to 250 mL by the addition of water. 

What volume of water must be added to: 
25.0 mL of a 0.55 mol/L solution to produce a 0.025 mol/L solution? 
50.0 mL of 3.5 mol/L KOH solution to make it to 0.35 mol/L? 

These are a couple of examples and hopefully I can figure out the rest by myself. I am having trouble finding the equation I need to use to solve the above. 

Thanks in advance!

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