Question #e9b89

1 Answer
Stefan V.
Jun 9, 2017

Here's what I got.

Explanation:

The molar mass of a compound is essentially the mass of #1# mole of said compound, so all you have to do here is figure out how many grams you get for #1# mole of your unknown compound.

You know that #10# moles of this compound have a mass of #"260 g"#, so you must determine what mass would make this ratio

#(color(blue)(?)color(white)(.)"g")/"1 mole" -># the molar mass of the compound

equivalent to

#"260 g"/"10 moles"#

Set up the equation as

#(color(blue)(?)color(white)(.)"g")/"1 mole" = "260 g"/"10 moles"#

Rearrange to find

#color(blue)(?) = (1 color(red)(cancel(color(black)("mole"))))/(10color(red)(cancel(color(black)("moles")))) * "260 g"#

#color(blue)(?) = "26 g"#

So, if #1# mole of this compound has a mass of #"26 g"#, you can say that its molar mass is equal to

#color(darkgreen)(ul(color(black)("molar mass" = "26 g mol"^(-1))))#

I'll leave the answer rounded to two sig figs, but keep in mind that you only have one significant figure for the number of moles present in your sample.

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