A mixture of H2 and water vapor is present in a closed vessel at 20°C. The total pressure of the system is 755. 0 mmHg. Partial pressure of water vapor at 20°C equals 17. 5 mmHg. What is the partial pressure of H2? mmHg.

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

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

the maximum mass of nh3 is nh3 in grams