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anonymous

  • one year ago

How many moles of H2O are in 42.0 g H2O? 2.33 mol H2O 5.25 mol H2O 6.00 mol H2O 7.56 mol H2O

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  1. anonymous
    • one year ago
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    can somene provide me the answer please thanks

  2. Photon336
    • one year ago
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    \[42.0g x (1mol H2O/18g) = 2.3 mol H2O\]

  3. Photon336
    • one year ago
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    The reason for this is that simply that you need to just set up your fraction, 1 mol contains 18.0 grams of water. and then multiply by the number of grams.

  4. Photon336
    • one year ago
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    if you notice grams cancel out and you're left with moles in the numerator. \[Grams \frac{ mol }{ grams } \]

  5. Photon336
    • one year ago
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    \[Grams \times \frac{ 1 }{ grams } = \frac{ Grams }{ Grams } = 1 \] This is why the units cancel out

  6. anonymous
    • one year ago
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    As mentioned the best way to set work this problem is to set up a table and cancel until you get what you want. Remember to go to moles from grams, divide by molar mass and to go from moles from grams multiply by molar mass.

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