+0

# b) The molar mass of gold is 0.197kg. Calculate the mass of a gold atom, to 3 SF. (1 mole = 6x1023)

0
747
4

he molar mass of gold is 0.197kg. Calculate the mass of a gold atom, to 3 SF. (1 mole = 6x10e23)

Guest Mar 3, 2015

#4
+91510
+5

Thanks Alan.

Melody  Mar 4, 2015
Sort:

#1
+26412
+5

Just divide the mass by Avogadro's number (given in the question as 6*1023)

$$\frac{0.197}{6\times 10^{23}}= 0.03283\times 10^{-23}kg$$

or

$$3.28\times 10^{-25}kg$$

.

Alan  Mar 3, 2015
#2
+91510
0

Thanks Alan,

So is there always  6x10^23 atoms in a mole (of anything) ?

Can you (or someone else) tell us a little about the significance of Avogadro's number? (Only if  is relatively easy to do.  )

Melody  Mar 4, 2015
#3
+26412
+5

By definition a mole is Avogadro's number worth!

Avogadro's number is more precisely given by: 6.02214129×1023

Have a look at http://en.wikipedia.org/wiki/Avogadro_constant for more details.

.

Alan  Mar 4, 2015
#4
+91510
+5