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3 years ago

Solid potassium fluoride decomposes into fluorine gas and solid potassium .

Chemistry

1 answer:

inna [77]3 years ago

8 0

2KF(s) -----> 2K(s)+F2(g)

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What is the wavelength of radiation emitted when an electron goes from the n = 7 to the n = 4 level of the Bohr hydrogen atom? G

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Answer:

the wavelength of radiation emitted is $\mathbf{\lambda= 2169.62 \ nm}$

Explanation:

The energy of the Bohr's hydrogen atom can be expressed with the formula:

$\mathtt{E_n =- \dfrac{13.6\ ev}{n^2}}$

For n = 7:

$\mathtt{E_7 =- \dfrac{13.6\ ev}{7^2}}$

$\mathtt{E_7 =-0.27755 \ eV}$

For n = 4

$\mathtt{E_4=- \dfrac{13.6\ ev}{4^2}}$

$\mathtt{E_4 =- 0.85\ eV}$

The electron goes from the n = 7 to the n = 4, then :

$\mathtt{E_7-E_4 = (-0.27755 - (-0.85) ) \ eV}$

$\mathtt{= 0.57245\ eV}$

Wavelength of the radiation emitted:

$\mathtt{\lambda= \dfrac{hc}{0.57245 \ eV}}$

where;

hc = 1242 eV.nm

$\mathtt{\lambda= \dfrac{1242 \ eV.nm }{0.57245 \ eV}}$

$\mathbf{\lambda= 2169.62 \ nm}$

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3 years ago

Why does tap water or pool water typically test positive for the presence of chlorine

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Pool water contains chlorine to keep it sanitary
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5. If the reaction of carbon monoxide and oxygen gas in question 2

zheka24 [161]

Answer: The mass in grams is 514.8.

Explanation:

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

$\text{Number of moles}=\frac{\text{Given molecules}}{\text{Avogadros number}}$

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Putting in the values we get:

$\text{Number of moles}=\frac{7.03\times 10^{24}}{6.023\times 10^{23}}=11.7moles$

mass of $CO_2=moles\times {\text {Molar mass}}=11.7mol\times 44g/mol=514.8g$

The mass in grams is 514.8.

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If ammonia were formed from Daltons simplest formula of one atom of each element what would he have concluded about the relative

professor190 [17]

He would hv concluded that the ratio of the masses of nitrogen to sulphur is in the ratio 1 :3

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