randomperson45
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A sample of gold (AU) has a mass of 57.01 g.
A) calculate the number of moles of gold (AU) in the sample. Show your work and highlight your final answer.

Chemistry

Respuesta :

krgspace03

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.

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

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