How many moles of nacl are required to prepare 0.80 l of 6.4 m nacl

How many ions that have a +1 charge will bond with an ion that has a -2 charge

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need