How many grams are in 6.54 moles of CH,?) I Element in
compound
Number
of atoms
Atomic mass
Total molar mass
per element
С
H
TOTAL molar mass of compound =

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

i would say b

explanation:

but i think i would need more information than that

there are two significant figures.