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Anna and Elena's Mole Project

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Elena Wentworth

on 20 April 2010

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Transcript of Anna and Elena's Mole Project

BY ANNA POTSCH AND ELENA WENTWORTH WHAT IS A MOLE? A mole is a measurement that helps convert units to other units. It represents the number 6.03 x10^23. Using the mole starts with balancing a chemical equation. STEP ONE:

Start with an unbalaced equation:

_NH3 + _O2 _N2 + _H20 In chemical reactions, products and reactants are not always perfectly balanced. For example on the left of the arrow, there is only one nitrogen in it's compound, but on the right side, there are two. This is how you can balance the equation: STEP TWO:

Balance the equation:

4NH3 + 3O2 2N2 + 6H2O We know that both of the sides of the equation are balanced because the coefficents balance out the number of the atoms in the elements and their compounds. Next, we'll look at how you incorporate this equation into a word problem. If you start with 30 grams NH3,
how many liters of H20 will be produced...? 4NH3 + 3O2 ---> 2N2 + 6H2O STEP ONE:

Make sure you have a balanced equation.
( refer back to this step..) STEP TWO:

Start with the given information. In this case, it will be 30 grams of NH3. 30 g NH3 1 mol NH3 6 mol H20 22.4 L H20
-------- x --------- x --------- x ----------
1 17.04 g NH3 4 mol NH3 1 mol H20

= 59.15 L H20 STEP THREE:

Convert the unit grams into moles by dividing one mole of the given by the molar mass of the given compound. STEP FOUR:

Set up a mole to mole ratio using the coefficent of the compound given, and what is being solved for. STEP FIVE: Divide 22.4 liters (the amount of volume to convert from moles to liters) of H2O by 1 mole of H20. STEP SIX:

Cancel out all like units ( they will be diagonally top and bottom) to make sure the result is in the unit you want to solve for. STEP SEVEN:

Multiply the top numbers of the equation together and divide by the product of the bottom numbers. STEP EIGHT:

Label your answer with the correct unit and compound ( the unit and compound left by the volume should be the unit and compound you want to solve for. )
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