How many moles are there in 67.2 grams of h2

Which substances have the lowest melting points: ionic covalent, or metallic

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.