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denis-greek [22]
3 years ago
14

The breakdown of dopamine is catalyzed by the enzyme monoamine oxidase (MAO). What is the final concentration of product if the

starting dopamine concentration is 0.050 M and the reaction runs for 5 seconds. (Assume the rate constant for the reaction is 0.249 s^-1.)
A) 0.050 M
B) 0.014 M
C) 0.018 M
D) 1.2 M
E) 0.025 M
Chemistry
2 answers:
solmaris [256]3 years ago
5 0

Answer:

The answer is: B) 0.014 M

Explanation:

The reaction is the first order, then:

-\frac{dC}{dt} =KC\\Integrating\\C_{t} =C_{o} e^{-Kt}

Where

Ct = concentration in any time

Co = initial concentration = 0.05 M

K = 0.249 s⁻¹

t = 5 s

Replacing:

C_{t} =0.05e^{-0.249*5} =0.014M

kotegsom [21]3 years ago
3 0

Answer:

final concentration: Ca = 0.014 M

Explanation:

Velocity of reaction:

  • ra = K(Ca)∧α = δCa/δt

∴ α: order of reaction, assuming α = 1

∴ K = 0.249 s-1.......rate constant

∴ Cao = 0.050 M......initial concentration

∴ t = 5 s.......reaction time

⇒ δCa/δt = K*Ca

⇒ ∫δCa/Ca = K*∫δt

⇒ Ln(Cao/Ca) = K*t = (0.249s-1)(5 s) = 1.245

⇒ Cao/Ca = 3.473

⇒ Ca = 0.050/3.473

⇒ Ca = 0.014 M

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Answer:

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Explanation:

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L is amplitude M is wavelength and P is frequency
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Hydrogen gas is collected over water at 21 degrees Celsius. At 21 degrees Celsius the vapor pressure of water is 18.7 torr. If t
Alinara [238K]

Answer : The pressure of hydrogen gas is, 739.3 torr

Explanation :

As we are given:

Vapor pressure of water = 18.7 torr

Barometric pressure = 758 torr

Now we have to calculate the pressure of hydrogen gas.

Pressure of hydrogen gas = Barometric pressure - Vapor pressure of water

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3 0
3 years ago
A wave has a frequency of 3,5MHz and a wavelength of 85,5 m. What is the wave velocity through
Yuki888 [10]

Answer:

velocity = 29925×10⁶ m/s

Explanation:

Given data:

Frequency = 35 MHz

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Velocity = ?

Solution:

MHz to Hz

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Formula:

<em>velocity = Wavelength × Frequency</em>

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5 0
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In a constant‑pressure calorimeter, 60.0 mL of 0.300 M Ba ( OH ) 2 was added to 60.0 mL of 0.600 M HCl . The reaction caused the
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Answer:

Q sln = 75.165 J

Explanation:

a constant pressure calorimeter:

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∴ mol Ba(OH)2 = (0.06 L)(0.3 mol/L) = 0.018 mol

⇒ mass Ba(OH)2 = (0.018 mol)(171.34 g/mol) = 3.084 g

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∴ mol HCl = (0.06 L)(0.60 mol/L) = 0.036 mol

⇒ mass HCl = (0.036 mol)(36.46 g/mol) = 1.313 g

⇒ m sln = 3.084 g + 1.313 g = 4.3966 g

specific heat (C):

∴ C sln = C H2O = 4.18 J/g°C

∴ ΔT = 26.83°C - 22.74°C = 4.09°C

heat absorbed (Q):

⇒ Q sln = (4.3966 g)(4.18 J/g°C)(4.09°C)

⇒ Q sln = 75.165 J

8 0
3 years ago
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