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8_murik_8 [283]
2 years ago
14

The bond enthalpy of the C―N bond in the amide group of proteins can be treated as an average of C―N (276 kJ/mol) and C═N (615 k

J/mol) bonds. Calculate the maximum wavelength of light needed to break the amide bond.
Chemistry
1 answer:
Paraphin [41]2 years ago
6 0

Answer:

268 nm

Explanation:

First' let's calculate the average bond energy:

(276 + 615)/2 = 445.5 kJ/mol

By Avogadro's number 1 mol = 6.02x10²³ molecule, then the energy necessary to break the amide bond in 1 molecule is:

E = 445.5/6.02x10²³ = 7.4x10⁻²² kJ = 7.4x10⁻¹⁹ J

So, the wavelength of light (λ) can be calculated by:

E= h*c/λ

Where h is the Planck's constant (6.626x10⁻³⁴ J.s), and c is the light speed (3.0x10⁸ m/s).

7.4x10⁻¹⁹ = 6.626x10⁻³⁴ * 3.0x10⁸/λ

λ = 2.68x10⁻⁷ m

λ = 268 nm

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A volumetric pipette has an uncertainty of 0.01cm3. What are the lowest and highest possible volumes for a measurement of 0.20cm
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Answer:

Possible lowest volume = 0.19 cm

Possible highest volume = 0.21 cm

Explanation:

given data

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solution

we will get here Possible lowest and highest volume that is express as

Possible lowest volume = total volume - uncertainty   .....................1

Possible highest volume = total volume + uncertainty    ....................2

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Possible lowest volume = 0.20 cm - 0.01 cm

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A 3.50 g sample of rice is burned in a bomb calorimeter containing 1680 g of water. The temperature of the water increases from
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Calculate the mass percent of Cl in Freon -112 (C2 Cl4 F2), a CFC refrigerant
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Explanation:

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                       204 g of C₂Cl₄F₂  -----------------  100%

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It has been observed that FADH2 produce two(2) ATP while NADH produces three(3) ATP. The reason for this observation is that the production of electron in the FADH2 is at the lower enegy level. Because of this it can not transfer its electron to the first complex .

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