A student preparing a solution for an experiment measured the weight of the sample solute to be used. If she is supposed to use 2 moles of calcium hydroxide, she must use:
|A|| 57.1 grams|
|B|| 74.1 grams|
|C|| 114.2 grams|
|D|| 148.2 grams|
Ans. D This question tests your understanding of the concept of mole. The student is preparing a solution using calcium hydroxide. The formula of calcium hydroxide is Ca(OH)2. The formula weight of calcium hydroxide is 74.1 grams/mol. Here, the student added two moles of it. So the answer is 74.1 x 2 = 148.2 g.