anonymous
  • anonymous
The 64.8-g sample of the compound X2O5 contains 48.0 g of oxygen atoms. What is the molar mass of element X?
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Rushwr
  • Rushwr
What do u think ?
anonymous
  • anonymous
i don't know i tried 5 times & continue to get the wrong answer
Rushwr
  • Rushwr
Mass of X2 = 64.8g - 48g right?

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Rushwr
  • Rushwr
So the mass of X2 is 16.8g
Rushwr
  • Rushwr
Now we have to find the moles of oxygen
Rushwr
  • Rushwr
\[moles = \frac{ mass }{ molar mass} = \frac{ 48 }{ 16 } = 3moles\]
Rushwr
  • Rushwr
are u there?
anonymous
  • anonymous
yes
Rushwr
  • Rushwr
\[\frac{ 2 }{ 5 } = \frac{ xmoles }{ 3 }\] \[x moles = 1.2\] Now we know the moles of X2
anonymous
  • anonymous
okay..
Rushwr
  • Rushwr
we know the moles and the mass we just have to find the molar mass by using molar mass = mass/moles
Rushwr
  • Rushwr
\[molar mass = \frac{ 16.8 }{ 1.2 } = 14gmol ^{-1}\]
anonymous
  • anonymous
YES thank you
Rushwr
  • Rushwr
Welcome !!!!!!!!! DId u get it ? :)
anonymous
  • anonymous
yes!

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