CHEMISTRY COLLEGE

How many moles are in 12.0 grams of O2

Answers

Answer 1

Answer:

Moles = 0.375

Explanation:

Moles= m/M

= 12/32 = 0.375mol

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How much energy (in J) is lost when a sample of iron with a mass of 26.4 g cools from 74.0 ∘C to 26.0 ∘C?

Answers

Answer:

$Q=-526.6J$

Explanation:

Hello,

In this case, for the computation of the energy loss when the cooling process is carried out, we use the shown below equation:

$Q=mCp\Delta T$

Whereas we need the mass, specific heat and change in temperature of iron within the process. Thus, the only value we need is the specific heat that is 0.444 J/(g°C), therefore, we compute the heat loss:

$Q=26.4g*0.444(J)/(g\°C)*(26.0\°C-74.0\°C)\n \nQ=-526.6J$

Negative sign points out the loss due to the cooling.

Regards.

. An open manometer is filled with mercury. The mercury level is 12mm higher on the side open to the atmosphere. What is the total pressure of the gas, in kPa, if the atmospheric pressure is 100.8 kPa?

Answers

The total pressure of the gas, in kPa is equal to 102.4 kPa.

Given the following data:

Atmospheric pressure = 100.8 kPa

Pressure (open side) = 12 mm Hg

To determine the total pressure of the gas, in kPa:

First of all, we would convert the value of the pressure in mm Hg to kPa.

Conversion:

760 mm Hg = 101.325 kPa

12 mm Hg = X kPa

Cross-multiplying, we have:

$760X = 12* 101.325\n\n760X = 1,215.9\n\nX=(1215.9)/(760)$

X = 1.60 kPa

Now, we can calculate the total pressure by using this formula:

$Total\;pressure = Atmospheric \;pressure + Pressure (side)\n\nTotal\;pressure = 100.8 + 1.60$

Total pressure = 102.4 kPa

Answer:

102kPa

Explanation:

760mmHg = 101.325 kPa

12mmHg = x

Upon converting from mmHg to kPa we have;

x = ( 12 mm Hg x 101.325 kPa) / 760mmHg

x = 1.599868421 kPa

Total pressure = 100.8 kPa + 1.599868421 kPa

Total pressure = 102kPa

Question 16 Unsaved Which of the following diagrams represents the correct cycling of gases?A) Photosynthesis O2 Respiration CO2
B) Respiration O2 photosynthesis CO2
C) Photosynthesis H2 Respiration O2
D) Respiration CO2 photosynthesis H2

Answers

the answer is A:

Photosynthesis release O2 (oxygen)

then animals use oxygen for respiration and release Co2

Final answer:

The correct answer is A) Photosynthesis O2 Respiration CO2. Photosynthesis converts CO2 to O2, which is then used in respiration to be converted back into CO2. Both processes together create a continuous cycle.

Explanation:

The correct diagram that represents the cycling of gases between photosynthesis and respiration is A) Photosynthesis O2 Respiration CO2. Through the process of photosynthesis, plants convert carbon dioxide (CO2) and sunlight into oxygen (O2) and glucose. Organisms, including the plants themselves, then use that oxygen for respiration, during which they convert the oxygen back into carbon dioxide. The glucose is used for energy. This continuous cycling plays a critical role in life on Earth.

Learn more about Cycling of gases here:

brainly.com/question/11267534

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When the reaction mixture is worked-up, it is first washed three times with 5% sodium bicarbonate, and then with a saturated nacl solution. explain why?

Answers

Solution:

After the reaction of mixture is worked-up Washing three times the organic with sodium carbonate helps to decrease the solubility of the organic layer into the aqueous layer. This allows the organic layer to be separated more easily.

And then the reaction washed by saturated NACL we have The bulk of the water can often be removed by shaking or "washing" the organic layer with saturated aqueous sodium chloride (otherwise known as brine). The salt water works to pull the water from the organic layer to the water layer.

Why is predicting our future oil supply controversial and involves some uncertainty?I just need some explaining.

Answers

Natural resources such as oil that are as yet undiscovered are very difficult to predict or estimate; this creates huge uncertainty and large errors in even the most rigorous scientific efforts to predict future supply. Changes in oil drilling and discovery technology can and will completely change the eventual results in the search for undiscovered resources. The controversy lies in the desire to eliminate oil from the world's energy mix in order to prevent a perceived but uncertain risk of global warming and the desire to encourage the use of alternative energy in order to reduce that risk, even though so far no alternative energy source other than natural gas, coal, and nuclear energy has been able to compete with oil economically.

The Problem with predicting things like our natural supply of oil can be picked out to a LOT of different variables. For starters, we find a lot of oil in a myriad of different places. The frequency in which we find this oil could theoretically be linked to a computer and predicted like Stocks. But then again, since the rate changes almost as much as the finding sites, You can easily be slapped aside by prehistoric biology and geology. The other problem with predicting our supply is often controversial; "How much do we use" well, you have to look at individual countries or the entire planet. And that alone is a lot of work. Imagine knocking on your neighbor's door and asking exactly how much hot water he uses.... Every day.... For a year! Pretty creepy right? Not to mention intrusive. But the internet has some of these things, So lets say you managed to find the frequency of oil findings globally, and the rate of use for these areas. Well now you have even more problems. Because there are many different people looking for oil. And when they find it. They sell it. Or they sue eachother over who found it first. Because underground supplies are huge at times. Often companies will be drilling the same one. To get an exact count from one company you would need to track all of the oil possessed by them and the buyers, which is paperwork. Which is Highly variable depending on who you are counting from. Without Tainting your next variable. "Current processed supply." ie. The stuff already out of the ground. If you have got all of that counted and punched into the smartest computer you can find. Then you still have some data to collect. Because the numbers are always changing. And everyone uses a different amount every day. This alone can stop any predictions cold for obvious. Reasons. So in conclusion, There literally is a large amount of Static variables and a few constant variables to consider when predicting future supply. This is why simply internet searching these things often gives numbers that are highly different from eachother. Being both controversial and uncertain.

Which factor is likely to impact the possible number of compounds?

Answers

Answer:

The correct answer is the tendency of all the elements to react with every other element.

Explanation:

A component in which two or more elements are bonded chemically leads to the production of a compound. A compound refers to a pure component as it comprises elements that are in their pure state. The formation of a compound takes place when the elements react with each other based upon their reactivity.

For example, the element chlorine is deficient of one electron and the element sodium exhibits one additional electron. Thus, chlorine easily reacts with the sodium in order to obtain stability. Therefore, the formation of sodium chloride takes place. Hence, it can be concluded that the tendency of all the elements to react with every other element is the condition, which is possible to influence the probable number of compounds.

the impact of possible number of compounds is the ability of all elements to react with every other atoms

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