Question

Write the formula mass of (a) ${\mathbf{BaF}}_{\mathbf{2}}$and (b)${\mathbf{C}}_{\mathbf{6}}{\mathbf{H}}_{\mathbf{4}}{\mathbf{O}}_{\mathbf{4}}$with a reasonable number of digits. Use the periodic table inside the cover of this book to find atomic masses.

Short answer

1. The formula mass of ${\mathrm{BaF}}_2$is 175.323806 g/mol.
2. The formula mass of $C_6{H}_4{O}_4$is 140.0936 g/mol.

Step-by-step solution

Definition of periodic table.

The periodic table, also known as the periodic table of elements, is a table that shows the chemical elements in a tabular format. It's commonly used in chemistry, physics, and other disciplines, and it's considered a chemical icon.

Determine the formula mass of BaF2 .

(a)

Atomic weight:

Ba = 137.327 g/mol

F = 18.998403 g/mol

Formula mass = Ba+2F

Formula mass = 137.327 g/mol + 18.998403 g/mol

Formula mass = 175.323806 g/mol

Determine the formula mass of C6H4O4.

(b)

Atomic weight:

C = 12.0170 g/mol

H = 1.00794 g/mol

O = 15.9994 g/mol

Formula mass = 6C + 4H + 4O

Formula mass = 6(12.0170 g/mol) + 4(1.00794 g/mol) + 4(15.9994 g/mol)

Formula mass = 140.0936g/mol