2. Serena mixed two samples together: a
gray solid that smells like flowers and a gray
solid that smells like bleach. She analyzed
the results and found two ending
substances. One of the ending substances
was a white solid. This ending substance is
made up of the repeating group of atoms
shown above. Which of the diagrams to the
left shows the repeating groups of atoms
that make up the samples Serena mixed
together?

hcl + naoh → h2o + nacl

explanation:

hcl + naoh → h2o + nacl   is the reaction that is correctly balanced.

however, pcl3 + h2 → ph3 +3hcl, 2ca+ 3cl2 → cacl3, and c5h12 + 5o2 → 5co2 + 6h2o are not correctly balanced.

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