Question #e9b89

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Question #e9b89

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Answer 1 · 2017-06-09T11:33:28

Here's what I got.

Explanation:

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

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

$\frac{? . g}{1 mole} \to$ $(color(blue)(?)color(white)(.)"g")/"1 mole" ->$ the molar mass of the compound

equivalent to

$\frac{260 g}{10 moles}$ $"260 g"/"10 moles"$

Set up the equation as

$\frac{? . g}{1 mole} = \frac{260 g}{10 moles}$ $(color(blue)(?)color(white)(.)"g")/"1 mole" = "260 g"/"10 moles"$

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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Question #e9b89

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