Final answer:
The formula masses are calculated by adding the atomic masses of the elements in each compound. AgCl has a formula mass of 143.32 amu, PBr3 is 270.67 amu, CH3CONH2 (acetamide) is 59.07 amu, and Na3PO4 is 163.94 amu.
Step-by-step explanation:
To calculate the formula mass (also known as molecular weight) of a compound, we sum the atomic masses of the elements constituting the compound, according to their respective numbers in the formula. Here's how to calculate the formula mass for each compound listed:
Part A: AgCl
Ag (Silver) = 107.87 amu (atomic mass units)
Cl (Chlorine) = 35.45 amu
Formula mass of AgCl = 107.87 + 35.45 = 143.32 amu
Part B: PBr3
P (Phosphorus) = 30.97 amu
Br (Bromine) = 79.90 amu (Each Br, Total 3 Brs)
Formula mass of PBr3 = 30.97 + 79.90*3 = 270.67 amu
Part C: CH3CONH2
This is the formula for acetamide. To calculate its formula mass:
C (Carbon) = 12.01 amu (3 times)
H (Hydrogen) = 1.01 amu (6 times)
O (Oxygen) = 16.00 amu
N (Nitrogen) = 14.01 amu
Formula mass of CH3CONH2 = 12.01*3 + 1.01*6 + 16.00 + 14.01 = 59.07 amu
Part D: Na3PO4
Na (Sodium) = 22.99 amu (3 times)
P (Phosphorus) = 30.97 amu
O (Oxygen) = 16.00 amu (4 times)
Formula mass of Na3PO4 = 22.99*3 + 30.97 + 16.00*4 = 163.94 amu