You need to prepare 100 mL of a 0.050 M solution of calcium chloride (CaCl2). How many moles of CaCl2 are needed? . How many grams of CaCl2 are needed?

Answer 1

To find the number of moles needed, you need to calculate using the following equation: 0.05 moles CaCl2 / 1000 mL x 100 mL = 0.005 moles needed.

To get the number of grams needed, you need to consult the periodic table and add the atomic mass of Ca to twice the atomic mass of Cl.

Atomic mass Ca = 40.08 g, atomic mass 2 x Cl = x 35.45 = 70.90 g.

Molecular mass = 110.98 g./mole

0.005 moles CaCl2 x 110.98 g/mole = 0.555 g needed.