How Many Moles In A Solution... (Shout out to God for making this simple)

Tidbits you can't simply live life without... . . . . . . . 

• The concentration of a solution is usually given in moles per litre (mol L-1 OR mol/L). This is also known as molarity. 
• Concentration in mol/L or mol L^-1, or Molarity, is given the symbol c (sometimes M).
    Examples:
          [HCl] = 0.01 mol L^-1 (concentration implied by square brackets around formula)
  or
          c(HCl) = 0.01 mol L^-1 (c stands for concentration, formula given in brackets) 

c = n ÷ V

      c = concentration of solution in mol L^-1 (mol/L or M),
      n = moles of substance being dissolved (moles of solute),
      V = volume of solution in litres (L)

moles of solute given molarity and volume of solution: n = c x V 
volume of solution given moles of solute and molarity: V = n ÷ c 

Example/s:

How many moles of are contained in each of the following?

1.6 of a 0.92 solution 
 
.92M =  n / 1.6L
or
n = .92M X 1.6L

n = 1.472 = 1.5 mol (rounded to two significant numbers)


126 of a 1.73 solution 

* 1 Liter = 1000 Milliliters
* 1 Milliliter = 0.001 Liter

126mL =  0.126 liters

n = 1.73 X .126L

n = .21798 =  .218 mol (rounded to three significant numbers)


0.602 of a 2.0 solution  

n = 2.0 X .602L

n = 1.204 = 1.2 mol  (rounded to two significant numbers)