10 points. Thank you in advance?

A reaction produces 0.863 moles of H2O. How many molecules are produced?

balu736 [363]

To convert from moles to molecules, you multiply by Avogadro's constant.

0.863 moles H₂O * (6.022*10^23 molecules/1 mole) = 5.20*10^23 molecules H₂O

5.20*10^23 molecules of H₂O are produced.

4 0

3 years ago

Read 2 more answers

"If the rate of the catalyzed reaction were the same at 100 ∘C as it is at 21 ∘C, what would be the difference in the activation

Solnce55 [7]

The given question is incomplete. The complete question is as follows.

The enzyme urease catalyzes the reaction of urea, ( $NH_2CONH_2$ ), with water to produce carbon dioxide and ammonia. In water, without the enzyme, the reaction proceeds with a first-order rate constant of $4.15 \times 10^{-5} s^{-1}$ at $100^{o}C$ . In the presence of the enzyme in water, the reaction proceeds with a rate constant of $3.4 \times 10^{4} s^{-1}$ at $21^{o}C$ .

If the rate of the catalyzed reaction were the same at $100^{o}C$ as it is at $21^{o}C$ , what would be the difference in the activation energy between the catalyzed and uncatalyzed reactions?

Express your answer using two significant figures.

Explanation:

The reaction equation is as follows.

Urea + Water $\rightarrow CO_{2} + NH_{3}$

Hence, it is given that,

without enzyme: Rate = $4.15 \times 10^{-5} s^{-1}$ at $100^{o}C$

with enzyme: Rate = $3.4 \times 10^{4} s^{-1}$ at $21^{o}C$

Rate = $3.4 \times 10^{4} s^{-1}$ at $100^{o}C$

It is known that,

ln \frac{K_{2}}{K_{1}} = \frac{-E_{a}}{R}{\frac{1}{T_{2}} - \frac{1}{T_{1}}][/tex]

and, ln K = $\frac{-E_{a}}{RT} + ln A$

Let us assume that collision factor (A) is same for both the reactions.

Hence, $\Delta E = RT ln (\frac{K_{with enzyme}}{K_{without enzyme}})$

= $8.314 \times J/K mol \times (100 + 273) K \times ln (\frac{3.4 \times 10^{4}}{4.15 \times 10^{-5}})$

= 63672.8 J/mol

= 63.67 kJ/mol (as 1 kJ = 1000 J)

Thus, we can conclude that the difference in the activation energy between the catalyzed and uncatalyzed reactions is 63.67 kJ/mol.

8 0

3 years ago

You look in the refrigerator and find some orange drink you had forgotten was there. the drink now has an "off" taste and bubble

olchik [2.2K]

Answer : The main reason is because of fermentation the orange drink has off taste and bubbles in it.

Explanation : When the orange drink was opened and kept in the refrigerator it got exposed to the atmospheric micro-organisnms, which when started to decompose the drink generated the carbon dioxide bubbles and gave it a bad taste. The decomposed drink may be have turned into vinegar or some other compound which gave it a bad taste after the fermentation process.

5 0

3 years ago

If you are involved in a vehicle accident, you should not drink any alcohol up to ___ hours after the accident or you could be l

Luda [366]

Answer: 6

Explanation:

Alcohol is a psychoactive drug with a high number of side effects that can seriously affect our body. The amount and circumstances of consumption play an important role in determining the duration of intoxication. For example, consuming alcohol after a large meal is less likely to produce visible signs of intoxication than on an empty stomach.

Alcohol has a two-phase effect on the body, meaning that its effects change over time. Initially, it produces feelings of relaxation and joy, but later consumption can lead to blurred vision and coordination problems. Cell membranes are highly permeable to alcohol, so once alcohol is in the bloodstream, it can spread to almost all body tissues.

Unconsciousness can follow excessive consumption, and extreme levels of consumption can lead to alcohol poisoning and death. Death can also be caused by asphyxiation, if vomit - a frequent result of excessive drinking - blocks the windpipe and the individual is too drunk to respond. An appropriate first-aid response to an unconscious, drunk person is to place him or her in the recovery position.

When alcohol enters the bloodstream (30-90 minutes after ingestion), there is a decrease in the sugars present in the bloodstream, causing a feeling of weakness and physical exhaustion. This is because alcohol accelerates the transformation of glycogen (a substance that stores sugar in the liver) into glucose, which is then eliminated more quickly.

After the ingestion of alcohol, a series of effects or symptoms occur in the short term, depending on the dose ingested (although other individual factors are affected).

Euphoria and excitement phase

Intoxication: The nervous system is affected as the loss of the capacity to coordinate movements is caused, producing imbalance and sometimes falls. If abused, locomotor ataxia can occur, which is a paralysis characteristic of alcoholics.

Hypnotic or confused phase: Irritability, agitation, drowsiness, headache, ysarthria, ataxia, dysmetry, nausea and vomiting.
Anaesthetic phase or stupor and coma, inconsistent language.

Bulbar or death phase: Cardiovascular shock, inhibition of the respiratory center, cardio-respiratory arrest and death.

Alcohol is broken down mainly in the liver, which can metabolize about 1 drink per hour for men. Factors such as age, weight, gender, and the amount of food eaten can affect how quickly the body can process alcohol. The amount of time alcohol can be detected in blood is up to 6 hours. Then it is not recommended to drink alcohol until after 6 hours if you have been involved in an accident, since alcohol can be detected in the blood in that time range. Because of the effects alcohol has on the body and how it can affect driving, if alcohol is detected you can be legally charged with driving under its influence.

6 0

3 years ago

If a measurement is recorded as 1.2 cm, what is the smallest marking on the instrument?

zhannawk [14.2K]

The smallest marking would be 1/10th of a centimeter

5 0

2 years ago