Question

How many individual oxygen atoms are contained in 0.250 moles of propanoic acid, CH3CH2COOH, the compound that puts the bite in sharp cheddar cheese?

Answer 1

Given:

• The chemical formula of propanoic acid is CH₃CH₂COOH.
• The number of moles of propanoic acid = 0.250
• The value of Avogadro's number (NA) = 6.02*10²³

To find:

The number if atoms of oxygen present.

Solution:

• Each molecule of propanoic acid contains two atoms of oxygen.
• Number of moles of oxygen present = 0.250*2 = 0.5
• Number of atoms of oxygen present = 0.5*NA = 3.01*10²³

Answer:

The number if atoms of oxygen present = 3.01*10²³