3 years ago

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Chemistry

1 answer:

vaieri [72.5K]3 years ago

5 0

Answer:

whats the question

Explanation:

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Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron fallsfrom the n = 7 to the n

Helga [31]

Answer:

λ=2167.6 nm

The wavelength of light emitted is 2167.6 nm.

Explanation:

We recall that Eₙ= $\frac{-2.18*10^{-18} J}{n^{2} }$

since there was transition from n7 to n=4 we will first calculate the change in the energy i.e ΔE

ΔE=E₄-E₇

ΔE= $-2.18*10^{-18} J(\frac{1}{4^{2} } -\frac{1}{7^{2} } )$

ΔE=-9.1760*10^-20 J

Now:

|ΔE|=Energy of photon=h*v=h*c/λ

λ=h*c/|ΔE|

λ= $\frac{6.63*10^{-34}J.s*3.00*10^{8}m/s }{9.1760*10^{-20} J }$

λ=2.1676*10^-6 m

λ=2167.6*10^-9 m

λ=2167.6 nm

The wavelength of light emitted is 2167.6 nm.

5 0

3 years ago

Cho 2.3 gam natri vào 100ml nước . Tính nồng độ dung dịch thu được ( C% )

Anton [14]

Answer:

maybe speak in english than we can understand and help you sorryy

8 0

2 years ago

How do you dilute a concentrated solution?

AVprozaik [17]

Answer:

add more water

Explanation:

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3 years ago

4.00 moles of CU(CN)2<br><br>Find the number of grams

UNO [17]

Hey there!

Cu(CN)₂

Find the molar mass.

Cu: 1 x 63.546 = 63.546

C: 2 x 12.01 = 24.02

N: 2 x 14.07 = 28.14

-----------------------------------

115.706 grams

The mass of one mole of Cu(CN)₂ is 115.706 grams.

We have 4 moles.

115.706 x 4 = 463

4.00 moles of Cu(CN)₂ has a mass of 463 grams.

Hope this helps!

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3 years ago

What is the molar mass of a substance?

OlgaM077 [116]

oops pls forgive me I accidentally did the wrong question.

4 0

3 years ago