Exemplar Problems

Problem 15 : The molar mass of sulfur hexafluoride (SF₆) can be calculated by summing the molar masses of its constituent atoms:

• Sulfur (S): 32.07 g/mol
• Fluorine (F): 18.99 g/mol (approximate, as fluorine has multiple isotopes) So, the molar mass of SF₆ is (32.07 + 6 \times 18.99 = 32.07 + 113.94 = 146.01 , \text{g/mol}).

Solution :

Molar mass of SF₆ = (Molar mass of S) + 6 x (Molar mass of F) Molar mass of SF₆ = 32.07 g/mol + 6 x 18.99 g/mol Molar mass of SF₆ = 32.07 g/mol + 113.94 g/mol Molar mass of SF₆ = 146.01 g/mol