50 POINTS FOR THE RIGHT ANSWER PLEASE HELP Consider the reaction below:
2CO+ 02 —>2CO2

If 44.8 L of Co2 are produced at STP, How many moles of O2 are used in the
reaction?

We can write:

44.8 L CO₂ * (1 mol CO₂) / (22.4 L CO₂) * (1 mol O₂ / 2 mol O₂) = 1 mol O₂.

                    ↑ conversion from liters to moles ↑ molar ratio

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