Solutions help, please? And if you could, can you explain why? I don't really get how to solve these.
Thank you in advance(:

1. How many milliliters of a stock solution of 2.00M KNO3would you need to prepare 100.0 mL of 0.150M KNO3?

2. How many grams of K2SO4 would you need to prepare 1500 g of 5.0% (m/m) solution?

Question

Solutions help, please? And if you could, can you explain why? I don't really get how to solve these.
Thank you in advance(: 

1. How many milliliters of a stock solution of 2.00M KNO3would you need to prepare 100.0 mL of 0.150M KNO3?  

2. How many grams of K2SO4 would you need to prepare 1500 g of 5.0% (m/m) solution?

doc.brown · Answer

What's molarity?

anonymous · Answer

Molarity is the concentration of the number of moles in a solute per liter of solvent.

doc.brown · Answer

Moles per liter, exactly.  What's a mole?