How many moles are in 63 grams of water (H2O)?

3.496 mol of H2O

Explanation:

63 g H2O  x  __1 mol__  =  3.496 mol of H2O

                        18.016 g

Round to however many significant figures are asked for.

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