The formula weight of copper(II)chloride is ________ g.

Question

Quizplus · Accepted Answer

The formula weight of copper(II) chloride can be determined by adding the atomic weights of copper, two atoms of chlorine, and then multiplying by 2 as there are two moles of chloride atoms for every one mole of copper atom in the compound:

Copper: 63.55 g/mol
Chlorine: 35.45 g/mol
(2 x Chlorine): 70.90 g/mol

Formula weight of CuCl2 = (63.55 + 70.90) x 2 = 268.90 g/mol
Rounded to two significant figures: 134.45 g

The Formula Weight of Copper(II)chloride Is ________ G