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3 years ago

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

Biology

2 answers:

san4es73 [151]3 years ago

8 0

Answer:

Number of moles is 0.2894 moles Au

Given:

Mass of gold= 57.01 g

To find:

Number of moles

Formula:

<h2>Number of moles= Given mass/Molar mass of gold </h2>

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

<u>Note: </u>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

Kamila [148]3 years ago

6 0

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.

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