A sample of nitrogen occupies 10.0 liters at 25°C and 98.7 kPa. What would be the volume at 20°C and 102.7 kPa?

Answers

Answer 1

Answer: To solve the problem, we assume the sample to be ideal. Then, we use the ideal gas equation which is expressed as PV = nRT. From the first condition of the nitrogen gas sample, we calculate the number of moles.

n = PV / RT
n = (98.7x 10^3 Pa x 0.01 m^3) / (8.314 Pa m^3/ mol K) x 298.15 K
n = 0.40 mol N2

At the second condition, the number of moles stays the same however pressure and temperature was changed. So, the new volume is calculated as follows:

V = nRT / P
V = 0.40 x 8.314 x 293.15 / 102.7 x 10^3
V = 9.49 x 10^-3 m^3 or 9.49 L

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For a given chemical reaction, the addition of a catalyst provides a different pathway that(1) decreases the reaction rate and has a higher activation energy(2) decreases the reaction rate and has a lower activation energy
(3) increases the reaction rate and has a higher activation energy
(4) increases the reaction rate and has a lower activation energy

Answers

Answer: Option (4) is the correct answer.

Explanation:

Activation energy is the minimum amount of energy required by the reactants to participate in the chemical reaction.

Therefore, reactant molecules whose energy is less than the activation energy are not able to participate in the reaction. Hence, a catalyst lowers the activation energy so that molecules with less energy can also participate in the reaction.

Thus, a catalyst is a specie that increases the reaction rate and has a lower activation energy.

For a given chemical reaction, the addition of a catalyst provides a different pathway that "(4) increases the reaction rate and has a lower activation energy"

Which unit is used to express the pressure of a gas?

Answers

According to the International System of Units, the unit of pressure is pascal (Pa). However, in calculating, we use atmosphere (atm), which is also a unit of pressure, more often.
Hope this helps~

The unit used to express the pressure of gas is the pascal.

6Li + N2 2Li3NIf 12 mol of lithium were reacted with excess nitrogen gas, how many moles of lithium nitride would be produced?

4.0 mol
6.0 mol
12 mol
36 mol

Answers

Answer : The correct option is, 4.0 mole

Explanation : Given,

Moles of lithium = 12 mole

The given balanced chemical reaction is:

$6Li+N_2\rightarrow 2Li_3N$

By the stoichiometry we can say that, 6 moles of Li react with 1 mole of $N_2$ to give 2 moles of $Li_3N$

As, 6 moles of lithium react to give 2 moles of lithium nitride

So, 12 moles of lithium react to give $(12)/(6)* 2=4$ moles of lithium nitride

Therefore, the number of moles of lithium nitride produced will be 4.0 mole.

The answer would be B ur looking for the total reaction and the time that it takes for it I be produced Wich would be 6.0

Which of the following is an experiment? A) measuring the mean and standard deviation of measurements from a sample

B) generating outcomes based on some model of how they are really produced

C) comparing the outcomes of two different treatment protocols

D) recording the high and low temperature at a particular location every day

Answers

Answer: D) recording the high and low temperature at a particular location every day.

Explanation:

A experiment is a process which is conducted or performed to either support, refute or validate the hypothesis. It involves the detail repeatable procedure and the logical analysis of the outcomes of the results. It involves different variables which are compared to obtain the outcome of the experiment. For example the amount of water used everyday responsible for the plant height.

Among the options given, D) recording the high and low temperature at a particular location every day. is the correct option, temperature is a variable in the experiment. The change in the daily temperature of a location can be noted as observation of the experiment. This observation can be used to record the average temperature of the location.

D! because when you record something you will probably analyze the results and those are two big KEY components of an Experiment!

Why must water be heated at about 80 degrees during esterification

Answers

The esters need to evaporate to be smelled.

Potassium has nineteen protons. how many electrons does a neutral potassium atom have? a. 0
b. 17
c. 19
d. more information is needed to figure this out.

Answers

Answer:

c. 19

Explanation:

Potassium is a chemical element of the periodic table whose chemical symbol is K, whose atomic number is 19. It is an alkaline metal of white-silver color, which abounds in nature in the elements related to salt water and other minerals. It oxidizes rapidly in air, is very reactive, especially in water, and chemically resembles sodium. It is an essential chemical element.

The K having an atomic number of 19 means that it has 19 protons and in normal conditions for a neutral atom it will have 19 electrons, and being one step away from argon gas makes it extremely unstable.

It has 19 electrons. I hope this helps.

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