Question

The price of gold (molar mass = 196.97 g/mol) has varied so much over the last 30 years that with $100 you could buy as much as 2.6 troy ounces (81 g) of gold or as little as 0.13 troy ounces (4.0 g). calculate the amount in moles that these two masses of gold represent.

Answer 1

0.41 and 0.02 moles Au

Step-by-step explanation:

Moles:

81 grams (2.6 troy oz):

mole Au = 81g/(196.97 g/mole) = 0.41 moles Au

4.0g (0.13 oz):

mole Au = 4.0g/(196.97 g/mole) = 0.020 moles Au