When hydrogenation of two alkenes produce the same alkane, the more stable alkene has the ____________ heat of hydrogenation?

1 answer:

6 0

Let us define first what heat of hydrogenation means. This is commonly used as a measure of relative stability between two alkenes that result to the same alkane when it undergoes hydrogenation. The criteria is: the <em>smaller </em>the heat of hydrogenation, the more stable the alkene.

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Calculate the final temperature of a sample of carbon dioxide of mass 16.0 g that is expanded reversibly and adiabatically from

Pie

For your first question, that equation only works if your situation is occurring at a constant temperature. Your original question is such a situation - everything occurs at 298.15 K. Therefore, you can use this value in the equation to calculate work. For your second question, Charles' Law describes how the volume of gas changes as you heat or cool it, PROVIDED PRESSURE AND MOLES OF GAS REMAIN CONSTANT THE WHOLE TIME. In your original question above, temperature stays constant while volume changes. However, what they don't tell you is that this necessarily requires a change in either pressure or moles of gas. Because the question works with the same sample the of gas the whole time (i.e. moles are constant), it is pressure that is changing (and this change will occur according to Boyle's Law, since temperature and moles are held constant). Hope that clarifies things!

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3 years ago

Convert 6.71 moles NH3 to number of molecules.

svetlana [45]

Answer: There are $40.41 \times 10^{23}$ molecules present in 6.71 moles of $NH_{3}$ .

Explanation:

Given: Moles of $NH_{3}$ = 6.71 mol

According to the mole concept, 1 mole of every substance contains $6.022 \times 10^{22}$ molecules.

Therefore, molecules present in 6.71 moles are calculated as follows.

$Molecules = moles \times 6.022 \times 10^{23}\\= 6.71 \times 6.022 \times 10^{23}\\= 40.41 \times 10^{23}$

Thus, we can conclude that there are $40.41 \times 10^{23}$ molecules present in 6.71 moles of $NH_{3}$ .

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Q1: Erosion and weathering are often confused. How is erosion different from weathering? Give an example of each.

stepan [7]

Explanation:

Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils whereas erosion is the movement of weathered materials from one area to the other.

Erosion moves weathered materials and it causes them to change position. For example loose chips of rocks broken down as the rock weakens through alternate wetting and drying in tropical regions will remain in-situ until the agents of erosion comes to carry them away. The breaking is weathering and the carrying is erosion.

Learn more:

Wind erosion brainly.com/question/2115729

Examples of mechanical weathering:

Frost action
Pressure release

Examples of chemical weathering:

Oxidation
Carbonation

There are two types of weathering:

In mechanical weathering, a rock disintegrates into smaller chunks by the action of wind, water and glacier. For example in temperate and polar regions, water within rocks freezes. When water freezes it expands and causes tension within the rock. When temperature drops, water melts and the tension is relieved. This process causes a rock to crack. The crack will eventually become wider with time.
In chemical weathering, a rock decomposes by the action of chemicals formed in the rock. In karst regions where limestone forms, combination of rain water and carbon dioxide forms weak carbonic acid that reacts with calcite in limestone.

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Erosion brainly.com/question/2473244

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3 years ago

ANSWER QUICK PLEASE ILL GIVE BRAINLIEST AND 50 POINTS

yawa3891 [41]

Answer:

Single replacement and Zinc Sulfate

the 2nd one is double replacement and potassium nitrate

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2 years ago