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How many moles of gold are in 2.7*10^-10 grams of gold?

 Jun 2, 2014

Best Answer 

 #1
avatar+92 
+8

To figure out the number of moles, we just need to divide the amount of grams by the molar mass of gold which is 196.97.

2.7*10^-10 g Au / 196.97 g/mol = 1.37076712*10^-12 mol Au

Then we look at the significant figures. Having started with two, the answer must have two figures. Make sure to round the last digit.

1.4*10^-12 mol Au

 Jun 2, 2014
 #1
avatar+92 
+8
Best Answer

To figure out the number of moles, we just need to divide the amount of grams by the molar mass of gold which is 196.97.

2.7*10^-10 g Au / 196.97 g/mol = 1.37076712*10^-12 mol Au

Then we look at the significant figures. Having started with two, the answer must have two figures. Make sure to round the last digit.

1.4*10^-12 mol Au

Feitan Jun 2, 2014

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