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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
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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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can somene provide me the answer please thanks

Photon336
 one year ago
Best ResponseYou've already chosen the best response.3\[42.0g x (1mol H2O/18g) = 2.3 mol H2O\]

Photon336
 one year ago
Best ResponseYou've already chosen the best response.3The 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.

Photon336
 one year ago
Best ResponseYou've already chosen the best response.3if you notice grams cancel out and you're left with moles in the numerator. \[Grams \frac{ mol }{ grams } \]

Photon336
 one year ago
Best ResponseYou've already chosen the best response.3\[Grams \times \frac{ 1 }{ grams } = \frac{ Grams }{ Grams } = 1 \] This is why the units cancel out

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0As 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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