Asample of copper wire with a mass of 1.659 g is heated with excess powdered sulfur until the copper has combined with the sulfur, and all the extra sulfur has been burned off. the final product (a sulfide of copper ) has a mass of 2.080 g. calculate the empirical formula of the product, and name it.

There were eight people living in the house; they were completely dependent on six helpers which provided food and clothing, magazines and newspapers.

Edith Frank

She is an excellent mother, she always puts her children above all else. She has a difficult relationship with Anne, but feels comfort in knowing that Anne has a strong one with Otto.

Otto Frank

He feels responsible for the atmosphere in the Secret Annex and mediated every single argument. He is the peacemaker, the calm one.

Margot Frank

She is very quiet and withdrawn. She is a very lonely girl and share very little about her feelings.

Anne Frank

There are two personalities inside of her; one is superficial and funny, and the other one is serious. When she is surrounded by people, she is definitely the first one. They both love writing.

Hermann Van Pels

He is a joker, but he also gets very grumpy. He knows a lot about politics and he is always optimistic.

Auguste Van Pels

She is the housewife in the Secret Annex, she cooks for everyone and always tries her best. She has many rows with her husband and screams a lot, but short after it comes the reconciliation period.

Peter Van Pels

He is the only one that has his own room. He spends a lot of time lazing around on his bed or doing carpentry. He always seems disinterested.

Fritz Pfeffer

He is a dentist and he also studied medicine. He has his instrument in the house and helps everyone when needed.