Question

A pure gold coin contains 0.145 moles of gold. What is the mass?

Answer 1

The mass of a pure gold coin with 0.145 moles of gold is calculated by multiplying the number of moles by the molar mass of gold, resulting in a mass of 28.56 grams.

Step-by-step explanation:

To find the mass of a pure gold coin containing 0.145 moles of gold, we use the concept of molar mass, which is the mass of one mole of a substance. The molar mass of gold (Au) can be determined from the periodic table and is approximately 196.97 g/mol.

Using the formula for mass calculation:

1. Mass (m) = number of moles (n) × molar mass (M)
2. m = 0.145 moles × 196.97 g/mol
3. m = 28.56 grams (rounded to two decimal places)

Therefore, the mass of the gold coin would be 28.56 grams.