In my Anatomy & Physiology class, our first exam had two Molarity problems on it. I am quite sure I know how to answer molarity problems easily, but these two left me a bit blank on figuring out the percentage of the first problem and the correct solution for the second. Our teacher gave everyone the opportunity to bring our exam questions home and do it at home as well. He is going to average the two exam grades together for the final grade.
The first problem is: 3.3g of calcium chloride was dissolved in 111 ml of water. Calculate the molarity and the percentage of calcium chloride. Calcium chloride, I believe, has an atomic weight of 111. My molarity answer came out as 2.7m. The percentage, I thought, rounded to 30%. However, a part of me is thinking the correct answer is 2.9%. I am not sure what I am doing wrong.
The second problem is: Half of the formula weight (FW) of glucose (in grams) was dissolved in 10 times the formula weight of glucose (in ml). Calculate molarity. Half of the formula weight of glucose, in grams, would be 90. I cannot figure out the other part of the question, so I cannot determine the answer.
Any ideas?
The first problem is: 3.3g of calcium chloride was dissolved in 111 ml of water. Calculate the molarity and the percentage of calcium chloride. Calcium chloride, I believe, has an atomic weight of 111. My molarity answer came out as 2.7m. The percentage, I thought, rounded to 30%. However, a part of me is thinking the correct answer is 2.9%. I am not sure what I am doing wrong.
The second problem is: Half of the formula weight (FW) of glucose (in grams) was dissolved in 10 times the formula weight of glucose (in ml). Calculate molarity. Half of the formula weight of glucose, in grams, would be 90. I cannot figure out the other part of the question, so I cannot determine the answer.
Any ideas?