Question

periodic table
a reaction requires 2.5 moles of zinc oxide. how many grams would this equate to?
a. 81.4 g
b. 163.5 g
c. 203.5 g
d. 32.6 g

Explanation:

Step1: Calculate the molar mass of zinc oxide ($ZnO$)

The molar mass of $Zn$ (zinc) is $65.4\ g/mol$ and the molar mass of $O$ (oxygen) is $16.0\ g/mol$.
The molar mass of $ZnO$ is $M = 65.4+16.0=81.4\ g/mol$.

Step2: Use the formula $m = n\times M$ (where $m$ is mass, $n$ is moles, and $M$ is molar mass)

Given $n = 2.5\ mol$ and $M = 81.4\ g/mol$.
$m=2.5\times81.4 = 203.5\ g$.

Answer:

C. $203.5\ g$