How many grams are there in 2 x 1024 molecules of BCl3?

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How many grams are there in 2 x 1024 molecules of BCl3?

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Thiên Di 3 years 2021-08-28T16:56:34+00:00 1 Answers 9 views 0

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  1. minhkhoi
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    2021-08-28T16:58:26+00:00
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    Answer:

    How many grams are there in 1×10^24 molecules of BCl3? I use 117.17 as the molecular weight.

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    How many grams are there in 1×10^24 molecules of BCl3? I use 117.17 as the molecular weight.

    Did you try approaching this problem with dimensional analysis?

    We know:

    1×1024 molecules

    117.17 g/mol

    And we want our answer to be in g.

    molecules ×gmolדconversion factor”=g

    The conversion factor has to have units of

    molmolecules in order for everything to work out.

    What property do you know that has units of molmolecules?

    I don’t know of any, but I do know that Avogadro’s number has units of moleculesmol. So for our conversion factor, we divide by Avogadro’s number, which is the same thing as multiplying by its inverse.

    1×1024 molecules×117.17 gmol×mol6.022×1023molecules=

    The “molecules” units cancel. The “mol” units cancel. Leaving us with “g”. The dimensions (units) work out. Now just do the math with the numbers.

    Explanation:

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