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Elan Coil [88]
3 years ago
11

What is the percent by mass of oxygen in al2o3 ?

Chemistry
1 answer:
Snezhnost [94]3 years ago
4 0
mr oxygen= 16. 16 x 3= 48
mr Al2O3= 27 + 27 + 48= 102

(48/102) X 100%= 47.05% oxygen
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Answer:

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Explanation:

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For calculating the mass of hydrogen:

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Step 1 : convert given masses into moles.

Moles of C =\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{3.338g}{12g/mole}=0.278moles

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Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

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For H =\frac{0.278}{0.104}=3

For O =\frac{0.104}{0.104}=1

The ratio of C : H : O = 3: 3: 1

Hence the empirical formula is C_3H_3O.

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