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4 years ago

What's the difference between 10 and 6 ?

2 answers:

8 0

Finding the difference in math usually means to subtract to numbers. In the case of your problem though, I think the correct answer would just be 4...

vagabundo [1.1K]4 years ago

3 0

<span>Difference result is 4

</span>

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Is a pencil a compound or an element and is a pencil heterogeneous or homogeneous

masya89 [10]

Answer:

Pencil is an element and a heterogeneous mixture

Explanation:

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3 years ago

Read 2 more answers

Where the oxygen comes from the air (21% O2 and 79% N2). If oxygen is fed from air in excess of the stoichiometric amount requir

guajiro [1.7K]

Answer:

$y_{O2} =4.3$ %

Explanation:

The ethanol combustion reaction is:

$C_{2}H_{5} OH+3O_{2}$ → $2CO_{2}+3H_{2}O$

If we had the amount (x moles) of ethanol, we would calculate the oxygen moles required:

$x*1.10(excess)*\frac{3 O_{2}moles }{etOHmole}$

Dividing the previous equation by x:

$1.10(excess)*\frac{3 O_{2}moles}{etOHmole}=3.30\frac{O_{2}moles}{etOHmole}$

We would need 3.30 oxygen moles per ethanol mole.

Then we apply the composition relation between O2 and N2 in the feed air:

$3.30(O_{2} moles)*\frac{0.79(N_{2} moles)}{0.21(O_{2} moles)}=121.414 (N_{2} moles )$

Then calculate the oxygen moles number leaving the reactor, considering that 0.85 ethanol moles react and the stoichiometry of the reaction:

$3.30(O_{2} moles)-0.85(etOHmoles)*\frac{3(O_{2} moles)}{1(etOHmoles)} =0.75O_{2} moles$

Calculate the number of moles of CO2 and water considering the same:

$0.85(etOHmoles)*\frac{3(H_{2}Omoles)}{1(etOHmoles)}=2.55(H_{2}Omoles)$

$0.85(etOHmoles)*\frac{2(CO_{2}moles)}{1(etOHmoles)}=1.7(CO_{2}moles)$

The total number of moles at the reactor output would be:

$N=1.7(CO2)+12.414(N2)+2.55(H2O)+0.75(O2)\\ N=17.414(Dry-air-moles)$

So, the oxygen mole fraction would be:

$y_{O_{2}}=\frac{0.75}{17.414}=0.0430=4.3$ %

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3 years ago

Light bending as it passes through a rain drop is an example of Transmission Diffraction Refraction Reflection

Yuliya22 [10]

The answer would be the third one listed, Refraction

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3 years ago

HOLMIUM

Sophie [7]

Answer:

1. The graph where x axis and y axis are present is called coordinate.

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3 years ago

An astronomer wants to study celestial objects with the shortest wavelengths. What kind of telescope should the astronomer use f

Leni [432]

Answer:

telescope

Explanation:

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3 years ago