En una reacción química se produjeron 5.02 x 1023 moléculas de ZnO. ¿A cuántos gramos corresponde esta cantidad de moléculas?

67.6g

Explanation:

Given parameters:

Number of molecules  = 5.02 x 10²³molecules

Unknown:

Mass of ZnO  = ?

Solution;

To solve this problem, we convert the given molecules to number of moles first.

        6.02 x 10²³ molecules is contained in 1 mole of a substance

         5.02 x 10²³ molecules will contain   = 0.83mole of ZnO

Now;

  Mass of ZnO  = number of moles x molar mass

        Molar mass of ZnO  = 65.4 + 16  = 81.4g/mol

Mass of ZnO  = 0.83 x 81.4  = 67.6g

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

the correct answer would be d. hope this !