D. yes - non metals are elements and elements are pure substances
I know this isn't much use but I'd guess at either C or D
Answer:
<h3>H2O (water)</h3><h3>N2 (nitrogen)</h3><h3>O3 (ozone)</h3><h3>CaO (calcium oxide)</h3><h3>
Explanation:</h3>
<u>H</u><u>OPE </u><u>IT</u><u> HELPS</u>
Just take the molar mass of each element and find the sum of all of them
Fe = 55.8
N = 14 (x3)
O = 16 (x9)
Add those up!
That will equal 241.8
<span> POCl3 is the correct way to write the chemical formula for this compound</span>