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anonymous

  • one year ago

The 64.8-g sample of the compound X2O5 contains 48.0 g of oxygen atoms. What is the molar mass of element X?

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  1. Rushwr
    • one year ago
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    What do u think ?

  2. anonymous
    • one year ago
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    i don't know i tried 5 times & continue to get the wrong answer

  3. Rushwr
    • one year ago
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    Mass of X2 = 64.8g - 48g right?

  4. Rushwr
    • one year ago
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    So the mass of X2 is 16.8g

  5. Rushwr
    • one year ago
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    Now we have to find the moles of oxygen

  6. Rushwr
    • one year ago
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    \[moles = \frac{ mass }{ molar mass} = \frac{ 48 }{ 16 } = 3moles\]

  7. Rushwr
    • one year ago
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    are u there?

  8. anonymous
    • one year ago
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    yes

  9. Rushwr
    • one year ago
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    \[\frac{ 2 }{ 5 } = \frac{ xmoles }{ 3 }\] \[x moles = 1.2\] Now we know the moles of X2

  10. anonymous
    • one year ago
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    okay..

  11. Rushwr
    • one year ago
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    we know the moles and the mass we just have to find the molar mass by using molar mass = mass/moles

  12. Rushwr
    • one year ago
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    \[molar mass = \frac{ 16.8 }{ 1.2 } = 14gmol ^{-1}\]

  13. anonymous
    • one year ago
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    YES thank you

  14. Rushwr
    • one year ago
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    Welcome !!!!!!!!! DId u get it ? :)

  15. anonymous
    • one year ago
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    yes!

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