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Mass-Mole Stoichiometry

Calculations involving conversions of mass to moles and moles to mass

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You Can't Compare Apples to Oranges without Converting

Which is more?  1 Yen or 1 Yuan?

Credit: Images of Money
Source: http://flic.kr/p/9VwVc2
License: CC BY-NC 3.0


In society, people love to compare.  Whether it's money, height, or something else, people are always doing it.  For example, people mistakenly compare 100 British pounds to 200 Japanese yen.  Most people would automatically guess the 200 yen is worth more.  However, comparisons are worthless if there is no standard (100 British pounds are worth more).  Thus, people familiar with the US dollar would first convert non-US currency to US dollars and from there compare the worth.  Chemistry is no stranger to setting standards.  Sometimes, it’s nice to use mass to measure how much of a substance needs to be measured out.  It’s also nice to use moles to see relatively how much of a substance is being used.  For example, 1 mole of an element is equivalent to its molar mass (in grams)  in the Table of Elements.  

Creative Applications

  1. Let’s start with currency conversion.  http://www.xe.com/currencytables/?from=USD.  
    1. About how many British pounds can be exchanged for 1 US dollar?
    2. About how many Indonesian Rupiah can be exchanged for 1 US dollar? (Hint: It’s A LOT)
  2. Is 50 Chinese Yuan worth more or less than 8 Euro? (Hint: Convert into USD)
  3. Flip to a Table of Elements. http://www.ptable.com/
    1. 1 mole of oxygen has how many grams?
    2. 1 mole of uranium has how many grams?
  4. Which one has more moles, 100 grams of copper or 100 grams of gold? (Hint: convert into moles)



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Image Attributions

  1. [1]^ Credit: Images of Money; Source: http://flic.kr/p/9VwVc2; License: CC BY-NC 3.0

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