Answer to Question #135619 in General Chemistry for Luisa Jasmine Flores

Question

Sodium bicarbonate is commercially known as baking soda. How many grams and atoms of Oxygen are there in 15g of sodium bicarbonate?

Answer 1

Solution:

Sodium bicarbonate is a chemical compound with the formula NaHCO₃.

The molar mass of NaHCO₃ is 84 g/mol.

The atomic mass of Oxygen is 16 g/mol.

Now, In 84 g NaHCO₃ contains = (16 × 3) = 48 g Oxygen

hence, 15 g NaHCO₃ contains = (48 × 15) / 84 = 8.571 g Oxygen.

Mass of Oxygen is 8.571 g.

Moles of Oxygen = Mass / Atomic mass = (8.571 g) / (16 g/mol) = 0.5357 mol

One mole of any substance contains 6.02×10²³ units of that substance.

Thus:

Atoms of Oxygen = 0.5357 mol × 6.02×10²³ atoms/mol = 3.225×10²³ atoms of Oxygen

Answer: 8.571 grams and 3.225×10²³ atoms of Oxygen are there in 15 g of sodium bicarbonate.