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nikitadnepr [17]
3 years ago
7

Calculate the percent composition of aluminum oxide (Al2O3). *Show how you got the answer please!*

Chemistry
1 answer:
Charra [1.4K]3 years ago
3 0

Assume 1mol of Al2O3:

mm(Al) = 26.98g/mol

x2(moles needed in 1mol of Al2O3)

= 53.96g

~54g

mm(O) = 16.00g/mol

x3(moles needed in 1mol of Al2O3)

=48g

mm(Al2O3) = m(Al) + m(O)

= 102g/mol

x1mol

=102g (in 1 mol)

<em>What</em><em> </em><em>percent</em><em> </em><em>of</em><em> </em><em>the</em><em> </em><em>total</em><em> </em><em>does</em><em> </em><em>X</em><em> </em><em>or</em><em> </em><em>Y</em><em> </em><em>take</em><em> </em><em>up</em><em>?</em>

Just take the portion that it gets and divide by the total:

Al: 54/102 = 53%

O: 48/102 = 47% or 100%-53%=47%

<em>Notice that, with binary compounds, you only need to calculate one of the two elements: the remaining amount HAS to be taken up by the other element, or else there would be something else involved.</em>

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Reaction container holds 5.77g of P4 and 5.77g of O2. The following reaction occurs:
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<em>That means will remain 0.040 moles of O₂ and there are produced 0.0465 moles of P₄O₆</em>

<em />

For the second reaction:

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<em>2 moles of oxygen reacts per mole of P₄O₆</em>

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<em />

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b. There are produced:

0.040 moles O₂ * (1 mole P₄O₁₀ / 2 moles O₂) = 0.020 moles P₄O₁₀

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0.0265 moles P₄O₆ * (220g / mol) =

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