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Paha777 [63]
2 years ago
5

Which of the following is an example of erosion. A. Cold temperatures freeze the surface of a pond. B. During a drought a pond

dries up and all the fish die. C. The wind blows the topsoil from a freshly plowed piece of land

Chemistry
1 answer:
Ne4ueva [31]2 years ago
6 0

Answer:

The answer if more than likely C. (The wind blows the topsoil from a freshly plowed piece of land.)

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Butane C4H10 (g),(Hf = –125.7), combusts in the presence of oxygen to form CO2 (g) (Delta.Hf = –393.5 kJ/mol), and H2O(g) (Delta
shusha [124]

Answer: The enthalpy of combustion, per mole, of butane is -2657.4 kJ

Explanation:

The balanced chemical reaction is,

2C_4H_{10}(g)+13O_2(g)\rightarrow 8CO_2(g)+10H_2O(g)

The expression for enthalpy change is,

\Delta H=[n\times H_f_{products}]-[n\times H_f_{reactants}]

Putting the values we get :

\Delta H=[8\times H_f_{CO_2}+10\times H_f_{H_2O}]-[2\times H_f_{C_4H_{10}+13\times H_f_{O_2}}]

\Delta H=[(8\times -393.5)+(10\times -241.82)]-[(2\times -125.7)+(13\times 0)]

\Delta H=-5314.8kJ

2 moles of butane releases heat = 5314.8 kJ

1 mole of butane release heat = \frac{5314.8}{2}\times 1=2657.4kJ

Thus enthalpy of combustion per mole of butane is -2657.4 kJ

3 0
3 years ago
In which example is matter changing
just olya [345]
A) heating a pan of water until the water is all gone because then it would change from a liquid top a gas.
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3 years ago
What process takes place when hydrogen-3 and hydrogen-2 combine to form
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Answer:

A. Fusion

Explanation:

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When cleaning up a local beach, students found many different particles that were in the water that affected the shoreline, like
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Your answer is C. Both gasoline and litter would need to be physically separated from the water, because neither bonds with the water.


8 0
3 years ago
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Calculate the vapor pressure in torr of a solution containng 24.5 g of glycerin (C3H8O3) in 135 mL water at 30.0* C; the vapor p
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Psolution = X · PH_20
= 0.966 · 31.8 torr
= 30.7 torr
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2 years ago
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