Sunday, July 28, 2013

A balloon contains 3.6 x 10^25 helium atoms. How many moles of helium atoms are present?I dont know how to do this question and my chemistry...

A mole is just like saying you have a certain amount of something.  When you say you have "ten" of something, it could be cats or atoms or pencils or ducks.  You could say you have "ten thousand" of those same items, but instead of using standard notation for the number (10,000) you could use scientific notation, 1 * 10^4, which is exactly the same amount of items. (The numeral 4 tells you how many zeros to place after the 1.)  You could be a little more than half a millionaire, and have $600,000, or 6 * 10^5 dollars.  To have a mole of something means to have a very large specific number of items, and it's roughly 6 followed by 23 zeros, or 6 * 10^23.  To be a bit more precise, a mole is actually 6.02 * 10^23, and all it signifies is how many of something, dogs, oranges, molecules, or atoms you have.


To say a balloon has a mole of helium atoms in it means it contains 6.02 * 10^23 atoms of helium.  If a balloon has 3.6 * 10^25 atoms, it means it has more than a mole of atoms (since 25 zeros means its a larger number than 23 zeros.)  To find out exactly how many moles, a bit of division is required.


First, take the first part of each number and divide, so 3.6/6.02, which gives you .598.  Now take the second part of each number, and in order to perform a division, subtract, so (10^25 - 10^23) which equals 10^2.  Put the parts together to get .598 * 10^2. But 10^2 is just 100, so the number could also be read as .598 * 100, or 59.8.  So your balloon has 59.8 moles of helium.

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