how do I set up . Calculate thmass in gm 02.3456 mol of Pb and then calculate the # of mol of 2.3456g of Pb ?

Question

how do I set up . Calculate thmass in gm 02.3456 mol of Pb  and then calculate the # of mol of 2.3456g of Pb ?

anonymous · Answer

As before, the number of moles can be calculated by:

$$n=m/M$$

n = number of moles
m = mass
M = molar mass

We can rearrange the equation to work out the mass when we know the number of moles already.

$$m = n \times M$$

So the number of moles is 2.3456. What is the molar mass of Pb from the periodic table?

anonymous · Answer

207.2

anonymous · Answer

the first part 2.3456 x 207.2/1molPb  ?

anonymous · Answer

Yep. 2.3456 multiplied by the molar mass of Pb which is 207.2

anonymous · Answer

How do I set up the second part ?

anonymous · Answer

What do we currently have which can help us solve the question? We know the mass, which is 2.3456, and we also know the molar mass of Pb. We're trying to find number of moles, so we use:

$$n=m/M$$

anonymous · Answer

So divide 2.3456g by 207.2

anonymous · Answer

Yep. Well done.

anonymous · Answer

Thank you again very helpful . Have a good day .

anonymous · Answer

Take care.