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Fifth Example
| In this fifth example we have both grams and moles. |
| How many grams of magnesium would it take to make 3.0 moles of magnesium
oxide? |
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| We start the calculation with 3.0 moles of MgO. We need to convert that
into grams of magnesium, so the conversion factor will have moles of MgO on the bottom and
grams of Mg on the top. |
3.0 moles MgO |
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= ? g Mg |
| From what we did in working with the balanced equation, we know that 2
moles of MgO is equivalent to 2 moles of Mg and that 2 moles of Mg weighs 48.6 g. So in
the conversion factor, 48.6 goes on top with grams of Mg and 2 goes on the bottom with
moles of MgO. |
3.0 moles MgO |
x |
48.6 g Mg
2 mole MgO |
= ? g Mg |
| Carrying out the calculation, we get 73 g of magnesium. |
3.0 moles MgO |
x |
48.6 g Mg
2 mole MgO |
= 73 g Mg |
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E-mail instructor:
Eden Francis
Clackamas Community College
©1998, 2002 Clackamas Community College, Hal Bender
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