Question

A pure gold coin contains 0.147 mol of gold(Au). What is its mass in grams? Note that molar mass of gold is 196.97 g/mol.

Answer 1

Just multiply the molar mass of gold with the number of moles of gold to cancel out the moles in the denominator:

0.147 mol * 196.97 g/mol = 28.95459 grams

Answer 2

0.147 mol * 196.97 g/mol = 28.95459 grams
NOTE: Just as a side note, you have 3 places in 0.147 so you can't have more than 3 in the answer so I would round 28.95459 to 29.0