“Calculate the volume of pure water that dilutes 100 ml of 12 M NaOH to 4.75 M.”

The volume of water to make 4.75 M of NaOH is 252.6 ml

Explanation:

For 12M NaOH:

For 4.75 NaOH:

On substituting, n = 1200 in the above formula:

Therefore, the volume of water to make 4.75 M of NaOH is 252.6 ml

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

im not exactly sure but i think its b!