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Licemer1 [7]
3 years ago
13

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

Chemistry
1 answer:
forsale [732]3 years ago
4 0

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
If a steel container holds 3.50 moles of hydrogen gas and 3.50 moles of helium gas, and the total pressure is 4.00 atm., what is
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Answer:

1. Partial pressure of H₂ = 2 atm

2. Partial pressure of He = 2 atm

Explanation:

The following data were obtained from the question:

Mole of H₂ = 3.50 moles

Mole of He = 3.50 moles

Total pressure (Pₜ) = 4 atm

Partial pressure of H₂ =?

Partial pressure of He =?

Next, we shall determine the mole fraction of each gas this can be obtained as follow:

Mole of H₂ = 3.50 moles

Mole of He = 3.50 moles

Total mole = Mole of H₂ + Mole of He

Total mole = 3.50 + 3.50

Total mole = 7 moles

Mole fraction of H₂ = mole of H₂ / Total mole

Mole fraction of H₂ = 3.5/7

Mole fraction of H₂ = 0.5

Mole fraction of He = mole of He / Total mole

Mole fraction of He = 3.5/7

Mole fraction of He = 0.5

1. Determination of the partial pressure of H₂.

Mole fraction of H₂ = 0.5

Total pressure (Pₜ) = 4 atm

Partial pressure of H₂ =?

Partial pressure of H₂ = Mole fraction of H₂ × Pₜ

Partial pressure of H₂ = 0.5 × 4

Partial pressure of H₂ = 2 atm

2. Determination of the partial pressure of He.

Total pressure (Pₜ) = 4 atm

Partial pressure of H₂ = 2 atm

Partial pressure of He =?

Total pressure (Pₜ) = Partial pressure of H₂ + Partial pressure of He

4 = 2 + Partial pressure of He

Collect like terms

Partial pressure of He = 4 – 2

Partial pressure of He = 2 atm

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A car with a mass of 3,500lbs accelerates negatively from 35m/s to 8m/s in 8s. What is the
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Answer:

a=-3.37\ m/s^2

Explanation:

Given that,

A car accelerates negatively from 35m/s to 8m/s in 8s.

We need to find the car's acceleration.

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Final speed, v = 8 m/s

Time, t = 8 s

The acceleration of an object is equal to the rate of change of velocity. So,

a=\dfrac{v-u}{t}

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So, the acceleration of the car is equal to -3.37\ m/s^2.

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