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

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.