Question

1. c₄h₈fcooh

of molecules:

of elements:

name of element:

of atoms:

total # of atoms:
the #4 is a (coefficient or subscript)

1. 2(nh₄)₃po₄

of molecules:

of elements:

name of element:

of atoms:

total # of atoms:
the #2 is a (coefficient or subscript)

Explanation:

Step1: Analyze $C_{4}H_{8}FCOOH$

For the number of molecules, without additional context, we assume 1. The elements are carbon (C), hydrogen (H), fluorine (F), oxygen (O). The number of carbon atoms: 5 (4 from $C_{4}$ and 1 from $COOH$), hydrogen atoms: 9 (8 from $H_{8}$ and 1 from $COOH$), fluorine atoms: 1, oxygen atoms: 2. Total number of atoms is $5 + 9+1 + 2=17$. The 4 in $C_{4}$ is a sub - script.

Step2: Analyze $2(NH_{4})_{3}PO_{4}$

The coefficient 2 means 2 molecules. The elements are nitrogen (N), hydrogen (H), phosphorus (P), oxygen (O). The number of nitrogen atoms: $2\times3 = 6$, hydrogen atoms: $2\times4\times3=24$, phosphorus atoms: $2\times1 = 2$, oxygen atoms: $2\times4=8$. Total number of atoms is $6 + 24+2 + 8=40$. The 2 in front is a coefficient.

Answer:

17)

of molecules: 1

of elements: 4

Name of element: Carbon, Hydrogen, Fluorine, Oxygen

of atoms: 5, 9, 1, 2

Total # of atoms: 17
The #4 is a subscript

18)

of molecules: 2

of elements: 4

Name of element: Nitrogen, Hydrogen, Phosphorus, Oxygen

of atoms: 6, 24, 2, 8

Total # of atoms: 40
The #2 is a coefficient