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2 years ago

11

At a certain temperature this reaction follows first-order kinetics with a rate constant of 2.01 s^âˆ’1

1 answer:

ddd [48]2 years ago

6 0

Answer:

0.80 seconds (2 significant figures)

Explanation:

The equation of the reaction is given as;

CICH2CH2Cl (g) --> CH2CHCI (g) + HCl(g)

Rate constant (k) = 2.01 s^-1

From the units of the rate constant, this is a first order reaction.

Initial Concentration = 1.34 M

t = ?

Final concentration = 20% of 1.34 = 0.268 M

The integrated rate law for a first order reaction is given as;

ln[A] = ln[A]o - kt

ln(0.268) = ln(1.34) - 2.01(t)

-2.01(t) = - 1.6094

t = 0.8007 ≈ 0.80 seconds (2 significant figures)

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If you mix 95 degrees C and 5 degrees C what temperature would you get?

forsale [732]

Answer:

Between $5^oC$ and $95^oC$

Explanation:

According to the second law of thermodynamics, heat flows from hotter objects toward colder objects.

Having a mixture of two components, one at a higher temperature of $95^oC$ and the other one at a lower temperature of $5^oC$ , heat will flow from the first object to the second one.

The temperature of the first object will decrease and the temperature of the second object will increase. Assuming no phase change, the final equilibrium temperature will be reached between $5^oC$ and $95^oC$ .

We cannot tell the exact temperature, unless we know the specific heat capacity of each material and their masses. The first object will give off heat given by:

$Q_1 = c_1m_1(95^oC - t_f)$

The second object will gain this heat by:

$Q_2 = c_2m_2(t_f - 5^oC)$

Since the heat given off is equal to the heat gained:

$c_1m_1(95^oC - t_f) = c_2m_2(t_f - 5^oC)$

Let's say that each object is water with a specific heat capacity of:

$c_1 = c_2 = 4.184 \frac{J}{g^oC}$

The mass of the first object is 10 g, the mass of the second one is 50 g, then:

$4.184 \frac{J}{g^oC}\cdot 10 g\cdot (95^oC - t_f) = 4.184 \frac{J}{g^oC}\cdot 50 g\cdot (t_f - 5^oC)$

The equation is simplified to:

$950 - 10t_f = 50t_f - 250$

$60t_f = 1200$

$t_f = 20^oC$

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3 years ago

Which method of heat transfer takes place when particles of matter vibrate and collide with each other in direct contact? Conduc

AleksandrR [38]

Answer:

The answer is Conduction.

Explanation:

Conduction occurs when particles collide and vibrate each other.

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3 years ago

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For heat transfer purposes, a standing man can be modeled as a 30-cm-diameter, 175-cm-long vertical cylinder with both the top a

tigry1 [53]

Answer:

Sgen = 0.0366 W/K

Explanation:

for the body:

∴ Q = - 336 W...rate of heat loss

∴ T surface = 35°C ≅ 308 K

the rate of entropy transfer from the body:

⇒ ΔS = - Q/Ts

for the enviroment:

⇒ ΔS = Q/Te

∴ assuming: T = Tenv = 25°C ≅ 298 K

resulting in a net variation in the universe:

⇒ Sgen = ΔS = Q/Tenviroment - Q/Tsurface = Q(Ts - Te)/Ts*Te

⇒ Sgen = (336( 308-298))/(308×298) = 3360 WK/91784 K² = 0.0366 W/K

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3 years ago

As NaOH is added to an aqueous solution, the pH will 1. decrease. 2. Not enough information is given to solve the problem. 3. be

Dominik [7]

PH increases when you add NaOH because it’s a strong base.

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2 years ago

A liquid has a density of 4.26g/ml. It has a mass of 2.2g. What is the volume of the liquid?

serg [7]

Answer:

Volume = .5164 ml

Explanation:

These are the equations you need to learn.

$Density = \frac{mass}{volume}$

$Volume = \frac{Mass}{Density}$

$Mass = Density * Volume$

Apply these concepts to your problem

$4.26 g/ml = \frac{2.2g}{x}$

$V = \frac{2.2g}{4.26g/ml}$

Divide 2.2/4.26

$V = 0.5164319248826291$

$Volume = .5164ml$

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3 years ago

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