Question

What is the mass of 3.91 × 1024 molecules of seo2? the molar mass of seo2 is 110.96 g/mol?

Answer 1

The answer is 720.68, but to 3 sig. figs it would be 721. You get this by:

3.91x10^24 (1mol/ 6.02x10^3 molecules) (110.96/ 1mol)= 720.68

Hope that helps!

Answer 2

Mass of
`3.91* 10^(24)` number of
`SeO_(2)` molecules is 720.3g

Step-by-step explanation:

Mass of 1 mol of
`SeO_(2)` is 110.96 g

We know, 1 mol of molecule =
`6.023* 10^(23)` number of molecules

So, mass of
`6.023* 10^(23)` number of
`SeO_(2)` molecules is 110.96 g

Hence mass of
`3.91* 10^(24)` number of
`SeO_(2)` molecules =
`(110.96* 3.91* 10^(24))/(6.023* 10^(23))g=720.3g`