1.Which substance has the highest molar mass? Tungsten
Lead
Xenon
Barium
2.At standard temperature and pressure, how many liters of gas are in one mole of that gas?
2.4 L
10.0 L
22.4 L
100.0 L
3. Given the reaction: H₃PO₄ + 3 KOH → K₃PO₄ + 3H₂O If I have 25.0 g of KOH, how much potassium phosphate should I end up with?
4. in the last question, what is the percent yield if I end up with 28.0 g of product?

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