Question

1. choose the best answer. what elements are in c3h8 (propane)? hydrogen and carbon chlorine and sulfur carbon and sodium oxygen and hydrogen 18. choose the best answer. how many atoms are in nh4no3? 9 12 7 4

Explanation:

Step1: Analyze elements in propane

The chemical formula of propane is $C_3H_8$. The symbol $C$ represents carbon and $H$ represents hydrogen. So propane contains carbon and hydrogen elements.

Step2: Count atoms in $NH_4NO_3$

In $NH_4NO_3$, there are 2 nitrogen ($N$) atoms (one from $NH_4^+$ and one from $NO_3^-$), 4 hydrogen ($H$) atoms from $NH_4^+$, and 3 oxygen ($O$) atoms from $NO_3^-$. So in total, $2 + 4+3=9$ atoms.

Answer:

1. hydrogen and carbon
2. 9