Achemist prepares a solution by adding 424 mg of cocl2 (mw = 129.84 g/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 500 ml . determine the molarity of the prepared solution.

Explanation:

1) Data:

a) mass = 422 mg

b) MW = 129.84 g/mol

c) V = 500 ml

d) M = ?

2) Chemical principles and formulae:

a) Molarity a the unit of concentration that measures the number of moles of solute per liter of solution:

b) The number of moles may be calculated by this formula:

3) Calculations:

a) Unit conversions

b) Number of moles of solute, n:

c) Molarity, M:

if you mean hydrogen and oxygen then water is the product