Question

what is the mass in grams of 2.90x10^12 lead (Pb) in atoms ?

Answer 1

What is the atomic weight of Pb?

Answer 2

207.2

Answer 3

\[2.90\times 10^{12}atoms Pb \times\frac{1 mole Pb}{6.023\times 10^{23}atoms Pb}\times\frac{207.2 g Pb}{1 mole Pb}\]

Answer 4

I think that works out to 9.98 x10^-10

Answer 5

how do you figure out the correct scientific notation ?

Answer 6

I just plug it into my calculator

Answer 7

But if you can't do that then do this:

Answer 8

\[\frac{2.90(207.2)}{6.023}=99.8\]

Answer 9

Now we must do the powers of 10

Answer 10

\[\frac{10^{12}}{10^{23}}=10^{-11}\]

Answer 11

So now we have:
\[99.8\times 10^{-11}\]

Answer 12

thank you !!

Answer 13

And we need to put that into scientific notation. Can you do that?

Answer 14

yes sir/ma'am

Answer 15

Good for you.