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3 years ago

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One of the wavelengths of light emitted by hydrogen atoms is 6.56 x 10-7 m. Calculate the Energy.

1 answer:

vovikov84 [41]3 years ago

3 0

The Energy of an atom of hydrogen with wavelength 6.56 × 10⁻⁷ m is
3.028 × 10⁻¹⁹ J.

I attached the working out and the answer to the question below.

Please note that C = speed of light, ν = frequency, λ= wavelength, h = Planck's Constant

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When benzene (c6h6) reacts with bromine (br2) bromobenzene(c6h5br) is obtained: c6h6 + br2 → c6h5br + hbr what is the theoretica

saveliy_v [14]

Answer A) : We have to calculate the number of moles of Benzene involved in the reaction,

30 g / 78 moles of benzene = 0.384 moles

For bromine it will be the same process,

65 g / 159.8 moles = 0.406 moles

By observing the reaction given above we can say that the reaction ratio of bromine and benzene is 1 : 1

We need to find the mass of bromobenzene,

which should be, 6(12) + 5 (1)+ 79.90 = 156.9 g/mol

So, the mass of bromobenzene will be 156.9 g/mol X 0.3846 mol = 60.343 g

Hence the theoretical yield will be 60.34 g

Answer B) : To calculate the actual yield we have to divide it with theoretical yield.

(56.7g / 60.343 g ) X100% = 93.96 %

Here, we can say that we got 93.96 % of actual yield.

As we know it is impossible to get 100% yield in any reaction.

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3 years ago

Which is a substance that is made up of only one type of atom?

deff fn [24]

The answer is element

5 0

3 years ago

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If you have 5.42 x 1024 aluminum atoms, approximately how many moles is that

sattari [20]

Answer:

<h2>9.00 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{5.42 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 9.0033$

We have the final answer as

<h3>9.00 moles</h3>

Hope this helps you

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How many grams are in 1.3 moles of Cr?

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Answer:

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Explanation:

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A device that transforms chemical energy to electrical energy, and provides electrical force in a current.

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