(a)Tetraphosphorous trisulfide(b)Ammonium nitrate Using the data in the periodic table, calculate the molecular (or formula) mass of the following compounds:19

(a) Tetraphosphorous trisulfide (P₄S₃)

1. Determine the atomic masses from the periodic table:

   • Phosphorus (P): approximately 30.97 g/mol
   • Sulfur (S): approximately 32.07 g/mol

2. Calculate the molecular mass:

   • P₄: 4 atoms of phosphorus 4 * 30.97 g/mol = 123.88 g/mol
   • S₃: 3 atoms of sulfur 3 * 32.07 g/mol = 96.21 g/mol

3. Add the masses together: 123.88 g/mol + 96.21 g/mol = 220.09 g/mol

The molecular mass of Tetraphosphorous trisulfide (P₄S₃) is 220.09 g/mol.

(b) Ammonium nitrate (NH₄NO₃)

1. Determine the atomic masses from the periodic table:

   • Nitrogen (N): approximately 14.01 g/mol
   • Hydrogen (H): approximately 1.01 g/mol
   • Oxygen (O): approximately 16.00 g/mol

2. Calculate the molecular mass:

   • NH₄: 1 atom of nitrogen and 4 atoms of hydrogen 1 * 14.01 g/mol + 4 * 1.01 g/mol = 14.01 g/mol + 4.04 g/mol = 18.05 g/mol
   • NO₃: 1 atom of nitrogen and 3 atoms of oxygen 1 * 14.01 g/mol + 3 * 16.00 g/mol = 14.01 g/mol + 48.00 g/mol = 62.01 g/mol

3. Add the masses together: 18.05 g/mol + 62.01 g/mol = 80.06 g/mol

The molecular mass of Ammonium nitrate (NH₄NO₃) is 80.06 g/mol.