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Being able to calculate how many moles are in a certain amount of matter is an important skill in both inorganic and organics chemistry. In short, plug in any given values into the equation and solve for .

  1. The equation you'll need to use is , or the numbers of moles is equal to the mass divided by the molar mass . [1]
  2. For example, if you have to calculate how many moles go into 74 g of hydrogen peroxide, you'll get , since you have 74 g of hydrogen peroxide, and the molar mass is 37 . [2]
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  3. The unit grams is both in the numerator and denominator so that cancels out. Moles is in the denominator of the denominator, which leaves you with moles in the numerator. The final answer is . [3]
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  • Question
    How do I convert 8 grams of Hydrogen into moles?
    Community Answer
    Number of moles = mass / molecular mass = 8 / 1 = 8, knowing that the molecular mass of hydrogen is one.
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