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madreJ [45]
3 years ago
10

Answer the following question: Ethanol, C2H5OH, is considered clean fuel because it burns in oxygen to produce carbon dioxide an

d water with few trace pollutants. If 150.0 g of H2O are produced during the combustion of ethanol, how many grams of ethanol were present at the beginning of the reaction?
Chemistry
1 answer:
Delvig [45]3 years ago
7 0

Answer:

127.88 grams of ethanol were present at the beginning of the reaction

Explanation:

Firstly, let's make the combustion reaction:

C₂H₅OH  +  3O₂  →  2CO₂  +  3H₂O

By 1 mol of ethanol, you can make 3 mole of water.

Mole of water = Water mass / Molar mass

150g / 18g/m = 8.3 mole

3 mole of water came from 1 mol of ethanol

8.3 mole came from (8.3 .1)/3 = 2.78 mole of ethanol

Molar mass ethanol = 46 g/m

Mole . molar mass = mass

2.78 m .  46g/m = 127.88 g

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The pathway by which carbon is transferred from living organisms to the atmosphere is called:
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Answer:

cellular respiration

Explanation:

All exergonic processes produced in the cell, through which substances oxidize and chemical energy is released, are grouped under the name of cellular respiration, but to break down an organic molecule the cells employ, mainly dehydrogenations that can be carried carried out in the presence or absence of atmospheric O2 oxygen. There are therefore two types of breathing: aerobic respiration and anaerobic respiration. The latter also called fermentation.

Aerobic respiration  (oxidative phosphorylation)

- Use molecular O2.

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3 0
3 years ago
For an exothermic reaction, what would the potential energy diagram most likely look like?
Artist 52 [7]
<span>Answer: it is a curve line that resembles a hill, where the reactants start at an intermediate height (on the left side), the activated complex is at the peak, and the products are in the through (the lowest level) at the right side.
</span><span />

<span>Explanation:
</span><span />

<span>1) The potential energy diagram shows the potential energy of the spieces in the vertical axis, as they progress from the reactants to the products (algong the horizontal axis. The horizontal axis represents the progress of the reaction. The reactants are in the left extreme of the graph, the activated complex is in the middle, and the products are in the right end.


2) In any chemical reaction (either exothermic or endothermic), the products are at a certain energy level that is below the energy level of the activated complex. The acitvated complex is at the ighest energy level (the peak of the curve) , which is the activation energy, this is the energy required to the reaction proceed from the reactants to the products.
</span><span />

<span>3) Since an exothermic reaction releases heat (energy) the energy (enthalpy) of the products is lower than the energy of the reactants. That is why the right end of the curve is lower than the left end.
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Since, one image is worther than one thousand words, I attache a picture of the energy graph for an exothermic reaction. See the figure attached.
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4 0
2 years ago
Which element is a halogen and has a larger average atomic mass than arsenic (As)?
olganol [36]
Answer:
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Explanation:
                    The atomic mass of Arsenic (As) is 74.92 amu. Also, we know that Halogen Group consists of following elements.

           Fluorine, Chlorine, Bromine, Iodine, Astatine and Tennessine

And in given four options only Chlorine and Iodine belongs to halogen family. And we know that the atomic mass of chlorine is 35.45 amu which is less than that of Arsenic, therefore Iodine with atomic mass of 126.90 amu is the correct answer.
3 0
3 years ago
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The temperature 30k expressed in degrees celsius is ?
prohojiy [21]
That is -273 + 30 = -243 degrees celsius
5 0
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