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Question

Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12g. The molar atomic mass of magnesium is 24gmol-1.


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Solution

Step 1: Analyse the formula to calculate the number of moles.

  • The number of moles can be calculated by using the formula:

Numberofmoles=GivenmassMolarmass

  • According to the question, the given mass is 12g and the molecular mass can be calculated.

Step 2: Calculate the molecular mass of helium.

  • To find the molecular mass, we will add the atomic masses of all of the atoms in the molecule.
  • In this case, there is only one atom of magnesium (Mg) in the molecule magnesium ribbon of (Mg).
  • So, the molecular mass of the magnesium ribbon =24gmol-1

Step 3: Calculate the number of moles.

  • The given mass is 12g and the molar mass is 24gmol-1
  • So, the number of moles of Mg are 12g24gmol-1=0.5moles

Hence, the number of moles of magnesium present in 12g of magnesium ribbon is 0.5moles.


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