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Tresset [83]
2 years ago
13

A) To generate the spectrum above a source capable of producing electromagnetic radiation with an energy of 7 * 10 ^ 4 * k * J p

er mole of photons was used. Such radiaton is from which region of the electromagnetic spectrum. Justify your answer with a calculation
Chemistry
2 answers:
marin [14]2 years ago
3 0

Answer:

Gamma

Explanation:

I'm not sure how to do it without calculations but:

E=hv

7*10^7 J/mol=6.626*10^34 Js * v

v=1*10^41

Gamma rays.

More here: https://www.hasd.org/faculty/AndrewSchweitzer/spectroscopy.pdf

-Dominant- [34]2 years ago
3 0

Answer:

These radiations is from X-rays region of the electromagnetic spectrum.

Explanation:

Energy of the 1 photon =E=7\times 10^4 kJ/mol

Energy of the photon :

E=\frac{7\times 10^4 kJ/mol}{N_A}

=\frac{7\times 10^7 J/mol}{6.022\times 10^{23} mol^{-1}} (1 kJ=1000 J)

E=1.1624\times 10^{-16} J

E=\frac{hc}{\lambda }

\lambda =\frac{6.634\times 10^{-34} Js\times 3\times 10^8 m/s}{1.1624\times 10^{-16} J}

E=1.712\times 10^{-9} m = 1.712 nm

These radiations is from X-rays region(0.1 nm to 10 nm) of the electromagnetic spectrum.

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drek231 [11]

Answer:

Aluminium atoms =  4.13 *10^22 aluminium atoms

The correct answer is E

Explanation:

Step 1: Data given

Mass of Al2O3 = 3.50 grams

Molar mass of Al2O3 = 101.96 g/mol

Number of Avogadro = 6.022 * 10^23 /mol

Step 2: Calculate moles Al2O3

Moles Al2O3 = mass Al2O3 / molar mass Al2O3

Moles Al2O3 = 3.50 grams / 101.96 g/mol

Moles Al2O3 = 0.0343 moles

Step 3: Calculate moles Aluminium

In 1 mol Al2O3 we have 2 moles Al

in 0.0343 moles Al2O3 we have 2*0.0343 = 0.0686 moles Al

Step 4: Calculate aluminium atoms

Aluminium atoms =  moles aluminium * Number of Avogadro

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Aluminium atoms =  4.13 *10^22 aluminium atoms

The correct answer is E

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2 years ago
the height of a column of mercury in barometer is 754.3mm. what us the atmospheric pressure in atm. in kPa.
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JulijaS [17]

Answer:

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If six A atoms form six product molecules, each molecule can contain only one A atom.

The formula of the product is ABₙ.

If n = 1, we need six atoms of B.

If n = 2, we need 12 atoms of B. However, we have only eight atoms of B, so the formula of the product must be AB.

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Explanation:

Credit goes to @znk

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