2. How many moles of copper are needed to react with sulfur to produce 0.25 moles of

copper (t) sulfide according to the following reaction:

2 Cu + S + Cu2S

What is the hydroxide ion concentration of a solution that has a pH of 9.630?

How many covalent bonds does carbon form in neutral compounds?

For an aqueous solution of hf, determine the van't hoff factor assuming 0% and 100% ionization, respectively. a solution is made by dissolving 0.0100 mol hf in enough water to make 1.00 l of solution.

Which suborbitals of the highest energy level will be filled for every ion, regardless of its charge? only the s only the p the s and the p the s, p, and d

The volume of a gas at standard temperature is 10 L. What is the temperature of the gas if the volume is changed from 10 L to 2 L

Relate the statement:"you cant get something for nothing" to the law of the conservation of mass

Which compound is sometimes found in fire extinguishers

The volume coefficient of thermal expansion for gasoline is 950 * 10-6 K-1. By how many cubic centimeters does the volume of 1.00 L of gasoline change when the temperature rises from 30°C to 50°C?

An element's most stable ion forms an ionic compound with bromine, having the formula XBr. If the ion of element X has a mass number of 85 and has 36 electrons, what is the identity of the element?

How many molecules are in 3 moles of Fe2O3?