Final answer:
There are approximately 0.337 moles of gold in 66.4 grams of gold. This is calculated by dividing the mass of the gold by its molar mass which is 196.97 g/mol.
Step-by-step explanation:
The student has asked: How many moles of au are in 66.4g of au? To answer this question, we need to use the concept of molar mass, which is the mass in grams of one mole of a substance. The atomic symbol for gold is Au, and the molar mass of gold (Au) is 196.97 g/mol. We can calculate the number of moles of Au by dividing the mass of the gold by its molar mass.
Number of moles of Au = Mass of Au (g) / Molar mass of Au (g/mol) = 66.4 g / 196.97 g/mol.
By doing the calculation, we find the number of moles of Au in 66.4 g:
Number of moles of Au = 66.4 g / 196.97 g/mol = 0.337 moles of Au
Therefore, there are approximately 0.337 moles of gold in 66.4 grams of gold.