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A compound with a molar mass of about 42 g/mol co…
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Problem 40 Hard Difficulty

A compound with a molar mass of about 28 g/mol contains 85.7% carbon and 14.3% hydrogen by mass. Write the Lewis structure for a molecule of the compound.

Answer

$\mathrm{C}_{2} \mathrm{H}_{4}$

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Chapter 7

Chemical Bonding and Molecular Geometry

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Video Transcript

So here we are, given that the molar mass of our compound is 28g, promote And were given information that the mass% 85.7 and we have 14.3% hydrogen. So we're going to assume that we have 100 g of our compound. So this would mean that we would have 85.7 g of carbon 14.3 g of hydrogen. So we should convert this into moles And as a result, you have about 7.14 moles of carbon, 14.3 Moles of Hydrogen. So we see the ratio of carbon hydrogen is about yields the following CH two. So since we have a molar mass of 28g per mole, The empirical formula will become C two H 4 as our molecular formula. And we can check and we see that this is equivalent to 28 g per mole. And this is uh the louis, basically the compound Athene, which we can draw by the following lewis structure. And this is our final answer.

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Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson

Chemistry

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