How much water must be added to 42.0 g of CaCl2 to produce a solution that is 40.0 wt% CaCl2?

For a liquid solution made by dissolving a solid or a gas in a liquid, the

What volume of 3.00 M CH3OH solution is needed to provide 0.500 mol of CH3OH?

Identify the polar solvent.

Zinc reacts with hydrochloric acid according to the equation:  Zn + 2HCl -> ZnCl2 + H2       How many moles of H2 are produced from 20.0 g of Zn?

Which of the following would be considered a base under the Arrhenius definition?

Silver sulphide and hydrogen combine to form silver and hydrogen sulphide.  3.0 g of H2 and 100 g of Ag2S are used to produce 85.0 g of Ag. The equation for the reaction is:  Ag2S + H2 -> 2Ag + H2S a)    What is the actual yield of silver (Ag)? b)    Which reactant is the limiting reagent? Support your answer with calculations.  c)    What is the theoretical yield of silver?

One mole of sodium atoms contains:

Potassium reacts with chlorine based on the following reaction:  2K + Cl2 -> 2KCl If 6 moles of K is reacted with 2 moles of Cl2, which reactant is the limiting reagent?

How many moles of Cu are needed to react with 4 mol of AgNO3 based on the following equation?  Cu + 2AgNO3 -> Cu(NO3)2 +2Ag