Question

Question #b8d89

Answer 1

From the formula, there are `3` `"C"` atoms for every `8` `"H"` atoms. So...

Explanation:

`5.60 * 10^24"H atoms" * "3 C atoms" / "8 H atoms" = 2.1* 10^24` `"C atoms"`

Now, to get to the mass of the sample, you must calculate the number of moles of `"C"_3"H"_8` in the sample, and then use the molar mass of `"C"_3"H"_8` to calculate the mass in grams:

`5.60* 10^24 "H atoms" xx ("1 molecule C"_3"H"_8) / "8 H atoms" xx ("1 mole C"_3"H"_8) / (6.02xx10^23 "molecules") = "1.162 moles C"_3"H"_8`

`"Molar mass" = 3 xx "12 g/mol" + 8 xx "1 g/mol" = "44 g/mol"`

So

`"Total mass" = "1.162 moles C"_3"H"_8 xx "44 g/mol" = "51.1 g C"_3"H"_8`