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Yuki888 [10]
3 years ago
14

Using the following thermochemical data, what is the change in enthalpy for the following reaction?

Chemistry
1 answer:
Mice21 [21]3 years ago
5 0
In calculating the change in enthalpy in a certain reaction, it is important to remember that it is the sum of the enthapy of formation for the substances involved in the reaction. 

<span>CaO(s)+2HCl(aq)→CaCl2(aq)+H2O(l)                          ΔH= –186kJ 
</span>Ca(OH)2(aq) →  CaO(s)+H2O(l)<span>                                     ΔH= 65.1 kJ
</span>Ca(OH)2(aq) + 2HCl(aq) → CaCl2(aq) + 2H2O(l)       ΔH= -120.9 kJ
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Predict the gravitational and electrostatic forces between molecules of gases? Provide evidence for your prediction.
zmey [24]

the electrostatic forces are 10^{36} larger than the gravitational force

Explanation:

Let's do the calculation by using two molecules of hydrogen, each containing 2 atoms of hydrogen.

The gravitational force between the two molecules is given by:

F=\frac{G m_1 m_2}{r^2}

where

G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2} is the gravitational constant

m1 and m2 are the masses of the two molecules: since they are identical,

m_1 = m_2 = 2m_p = 1.67\cdot 10^{-27} kg, twice the mass of the proton

r is the distance between the two  molecules

The force can be rewritten as

F_G=\frac{Gm_p^2}{r^2}

We can assume instead that electrostatic force between the two molecules is given by the interaction between the positively charged nuclei and the neatively charged electrons. Therefore,

F_E=\frac{kq_1 q_2}{r^2}

where

k=8.99\cdot 10^9 Nm^{-2}C^{-2} is the Coulomb's constant

q_1 = q_2 = 2e is the magnitude of the charge of each molecule, where

e=1.6\cdot 10^{-19}C is the fundamental charge

r is the distance between the two molecules

So the force can be  rewritten as

F_E=\frac{ke^2}{r^2}

Therefore, the ratio between the two forces is:

\frac{F_E}{F_G}=\frac{ke^2}{Gm_p^2}=\frac{(8.99\cdot 10^9)(1.6\cdot 10^{-19})^2}{(6.67\cdot 10^{-11})(1.67\cdot 10^{-27})^2}\sim 10^{36}

So, the electrostatic forces are 10^{36} larger than the gravitational force.

Learn more about electric force:

brainly.com/question/8960054

brainly.com/question/4273177

Learn more about gravitational force:

brainly.com/question/1724648

brainly.com/question/12785992

#LearnwithBrainly

6 0
3 years ago
¿Cuál es el % m/m de una disolución en que hay disueltos 22 g de soluto en 44 g de disolvente?
Archy [21]

The question is as follows: What is the% m / m of a solution in which 22 g of solute are dissolved in 44 g of solvent?

Answer: The% m/m of a solution in which 22 g of solute are dissolved in 44 g of solvent is 50%.

Explanation:

Given: Mass of solute = 22 g

Mass of solvent = 44 g

The percentage m/m is calculated using the following formula.

Mass percentage = \frac{mass of solute}{mass of solvent} \times 100

Substitute the values into above formula as follows.

Mass percentage = \frac{mass of solute}{mass of solvent} \times 100\\= \frac{22 g}{44 g} \times 100\\= 50 percent

Thus, we can conclude that the% m/m of a solution in which 22 g of solute are dissolved in 44 g of solvent is 50%.

5 0
3 years ago
Diana and Kinsey are put in charge of choosing a mascot for their basketball team. There are fifteen players on the team, but Di
castortr0y [4]

Answer: the data are inadequate .

Explanation:

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3 years ago
What number should not be changed in a balanced chemical equation
stich3 [128]
I think it’s always gonna be 2
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3 years ago
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A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?
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Answer:

Na

Explanation:

8 0
3 years ago
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