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3 years ago

Which of the two fuels below should have a higher octane rating? Please explain.

Chemistry

1 answer:

Dvinal [7]3 years ago

7 0

Answer:

2,3,3-trimethyl-pentane [CH3CH(CH3)C(CH3)2CH2CH3]

Explanation:

Octane number is index of indicating anti- knock properties of a fuel in comparison with mixture of iso-octane and heptane . Octane no of pure

iso-octane is 100 and that of heptane is 0 . The higher the ratio of highly branched compound , greater the octane number. 2,3,3-trimethyl-pentane

is highly branched so it has higher octane number.

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3 years ago

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Best Answer
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4 years ago

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What is the theoretical yield of Calcium if we begin with 12.6 grams of Aluminium?

AlladinOne [14]

The question is incomplete, here is the complete question:

The given chemical reaction is:

$2Al+3Cu(NO_3)_2\rightarrow 3Cu+2Al(NO_3)_3$

What is the theoretical yield of Calcium if we begin with 12.6 grams of Aluminium?

<u>Answer:</u> The theoretical yield of copper is 44.48 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of aluminium = 12.6 g

Molar mass of aluminium = 27 g/mol

Putting values in equation 1, we get:

$\text{Moles of aluminium}=\frac{12.6g}{27g/mol}=0.467mol$

The given chemical equation follows:

$2Al+3Cu(NO_3)_2\rightarrow 3Cu+2Al(NO_3)_3$

By Stoichiometry of the reaction:

2 moles of aluminium produces 3 moles of copper

So, 0.467 moles of aluminium will produce = $\frac{3}{2}\times 0.467=0.7005mol$ of copper

Now, calculating the mass of copper from equation 1, we get:

Molar mass of copper = 63.5 g/mol

Moles of copper = 0.7005 moles

Putting values in equation 1, we get:

$0.7005mol=\frac{\text{Mass of copper}}{63.5g/mol}\\\\\text{Mass of copper}=(0.7005mol\times 63.5g/mol)=44.48g$

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4 years ago

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DENIUS [597]

Answer:

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Explanation:

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3 years ago

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Sedbober [7]

Answer:

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