What is the molarity (m) of the following solutions?

a. 19.2 g of al(oh)3 dissolved in water to make 280 ml of solution

b. a 2.6 l solution made with 235.9 g of kbr

The molarity (M) of the following solutions are :

A. M = 0.88 M

B. M = 0.76 M

Explanation:

A. Molarity (M) of 19.2 g of Al(OH)3 dissolved in water to make 280 mL of solution.

Molar mass of Al(OH)3 = Mass of Al + 3(mass of O + mass of H)

                                      = 27 + 3(16 + 1)

                                      = 27 + 3(17) = 27 + 51

                                      = 78 g/mole

= 78 g/mole

Given mass= 19.2 g/mole

Moles = 0.246

Volume = 280 mL = 0.280 L

Molarity  = 0.879 M

Molarity  = 0.88 M

B .The molarity (M) of a 2.6 L solution made with 235.9 g of KBr

Molar mass of KBr = 119 g/mole

Given mass = 235.9 g

Moles = 1.98

Volume = 2.6 L

Molarity = 0.762 M

Molarity = 0.76 M

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