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algol [13]
3 years ago
10

Why are salt solutions not used to treat the roads during snow events when the temperature is below -15 degrees Celsius? *

Chemistry
1 answer:
Marta_Voda [28]3 years ago
3 0

Answer:

i think thats c

Explanation:

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The activation energy for proline isomerization of a peptide depends on the identity of the preceding residue and obeys Arrheniu
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Answer:

Activation energy of phenylalanine-proline peptide is 66 kJ/mol.

Explanation:

According to Arrhenius equation-     k=Ae^{\frac{-E_{a}}{RT}}    , where k is rate constant, A is pre-exponential factor, E_{a} is activation energy, R is gas constant and T is temperature in kelvin scale.

As A is identical for both peptide therefore-

                                   \frac{k_{ala-pro}}{k_{phe-pro}}=e^\frac{[E_{a}^{phe-pro}-E_{a}^{ala-pro}]}{RT}

Here \frac{k_{ala-pro}}{k_{phe-pro}}=\frac{0.05}{0.005} , T = 298 K , R = 8.314 J/(mol.K) and E_{a}^{ala-pro}=60kJ/mol

So, \frac{0.05}{0.005}=e^{\frac{[E_{a}^{phe-pro}-(60000J/mol)]}{8.314J.mol^{-1}.K^{-1}\times 298K}}

   \Rightarrow E_{a}^{phe-pro}=65705J/mol=66kJ/mol (rounded off to two significant digit)

So, activation energy of phenylalanine-proline peptide is 66 kJ/mol

7 0
3 years ago
75 ml of lemon juice are added to 50 ml of water. What is the percent by volume
natita [175]

Answer:

60%

Explanation:

Solute = the fruit juice  = 75mL

Solution= solute + solvent = 75+50 = 125mL

% of solute = solute/ solution  × 100 %

= 75/125  × 100 %

= 3/5 × 100 %

= 3 × 20 %

= 60%

I hope this was helpful, please rate as brainliest

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Explanation:

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