a hydrate of magnesium sulfate, MgSO4 has a mass of 13.52g. this sample is heated untill no water remains. The anhydrous magnesium sulfate has a mass of 6.60g. find the formula of the hydrate.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

the answers would be

the first one and the second one

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.