Question

A sample of gold (AU) has a mass of 57.01 g.

Answer 1

Answer:

Number of moles is 0.2894 moles Au

Given:

Mass of gold= 57.01 g  

To find:

Number of moles

Formula:

Number of moles= Given mass/Molar mass of gold

Molar mass of gold= 196.97 g/mol.

By substituting we get(57.01 g Au) / (196.97 g/moles) = 0.2894 moles Au  

Hence we get number of moles=0.2894 moles Au

Note: Molar mass= Mass of the sample of a compound/Total amount of that substance in that sample. Molar masses of different substances are the standard value which are specifically arranged to each compound

Answer 2

A). Calculation: Given mass of Au * 1mol of Au/molar mass of Au= # of moles ;

57.01 g Au*1 mole of Au/196.97g Au=0.3 moles of Au.  So the answer is 0.3 moles of gold(Au). Good luck on the rest,  and message me on Brainly if you need more help. I'll be happy to.