How could weathering by release of pressure affect the amount of weathering by freezing and thawing?

1 answer:

7 0

When the water in the cracks freezes, it expands by 9 to 10 percent, exerting pressure on the rock, according to BBC Bitesize. This action can widen the cracks in the rock, and when the temperature rises above freezing, the ice thaws, allowing the water to seep further into the cracks.

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How do you think temperature will affect the rate of a chemical reaction?

Luba_88 [7]

Answer:

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3 years ago

Using the standard enthalpies of formation found in the textbook, determine the enthalpy change for the combustion of ethanol c2

ArbitrLikvidat [17]

Enthalpy of formation is calculated by subtracting the total enthalpy of formation of the reactants from those of the products. This is called the HESS' LAW.
ΔHrxn = ΔH(products) - ΔH(reactants)

Since the enthalpies are not listed in this item, from reliable sources, the obtained enthalpies of formation are written below.
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Using the equation above,
ΔHrxn = (2)(-393.5 kJ/mol) + (3)(-285.5 kJ/mol) - (-276 kJ/mol)
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Answer: -1367.5 kJ/mol

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3 years ago

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Answer: 72 grams of water will be produced.

Explanation:

To calculate the number of moles, we use the formula: