The exit gas stream average molecular weight is 28.97 g/mol, and there will be 3.0 kg of leftover Phenanthrene in the reactor.
The balanced combustion equation for Phenanthrene is:
C₁₄H₁₀ + 21O₂ → 14CO₂ + 5H₂O
From the equation, we can see that 21 moles of oxygen are needed to combust 1 mole of Phenanthrene. Thus, to burn 10 kg of Phenanthrene, we need:
10,000 g / 178.24 g/mol = 56.05 moles of Phenanthreneand
21 * 56.05 = 1177.05 moles of O₂However, the supplied air is 30% less than the requirement, which means only 70% of the required O₂ will be supplied. Therefore, the actual amount of O₂ supplied will be:
1177.05 * 0.7 = 823.94 moles of O₂Assuming the air is mostly nitrogen, we can calculate the exit gas stream average molecular weight using the following formula:
Mw = (0.79 * 28.01) + (0.21 * 32) = 28.97 g/molwhere 0.79 and 0.21 are the mole fractions of nitrogen and oxygen in air, respectively, and 28.01 and 32 are the molecular weights of nitrogen and oxygen, respectively.
Finally, we can calculate the amount of leftover Phenanthrene in the reactor:
Amount of Phenanthrene consumed = 56.05 moles x 178.24 g/mol = 9999.72 gLeftover Phenanthrene = 10,000 g - 9999.72 g = 0.28 gHowever, this amount is negligible due to the large scale of the reaction. Therefore, we can round it off to:
Leftover Phenanthrene = 3.0 kg
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need help ASAP. I'll give brainliest to the person who answers CORRECTLY and the fastest.
We would need to 1.39 L of the stock solution and then make up to the 2.54 L mark.
What is the dilution formula?The dilution formula is used to calculate the new concentration of a solution after it has been diluted with a solvent. The formula is:
C1V1 = C2V2
where:
C1 = the initial concentration of the solution
V1 = the initial volume of the solution
C2 = the final concentration of the solution
V2 = the final volume of the solution
By the use of the formula;
C1V1 = C2V2
V1 = C2V2/C1
V1 = 2.54 * 6/11
V1 = 1.39 L
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What variable determines which
"R" value you use in your
calculation?
A. moles (n)
B. temperature (T)
C. pressure (P)
D. volume (V)
The variable that determines which "R" value to use in a calculation is pressure (P). The ideal gas law equation, PV = nRT, includes the universal gas constant (R), which has different values depending on the units used for pressure. If pressure is measured in atmospheres (atm), the value of R is 0.08206 L·atm/mol·K. If pressure is measured in pascals (Pa), the value of R is 8.314 J/mol·K. Similarly, if pressure is measured in other units such as torr, bar, or psi, a different value of R should be used. Therefore, the choice of "R" value to use in a calculation depends on the units of pressure being used in the problem.
Answer:C. pressure (P)
Explanation:
Which statement is true about cytokinesis?
*
2 points
Chromosomes start to decompress
Chromosomes are pulled towards the poles
A cell plate forms in plant cells
The nuclear envelope breaks down
The correct statement about cytokinesis is that a cell plate forms in plant cells. Option C is correct.
During cytokinesis, the cytoplasm of the parent cell divides into two daughter cells, each with its own nucleus and organelles. In animal cells, a contractile ring made of actin and myosin filaments forms around the cell's equator and contracts, pinching the cell in two.
In contrast, plant cells build a cell plate, which forms from vesicles produced by the Golgi apparatus, at the cell's equator. These vesicles fuse together and form a new cell wall to separate the two daughter cells. The other three options mentioned in the question are related to mitosis, which is the division of the nucleus, whereas cytokinesis is the division of the cytoplasm. Option C is correct.
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Imagine that you have a 7.00 L
gas tank and a 2.00 L
gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 155 atm
, to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
We need to fill the acetylene tank to a pressure of 44.29 atm to ensure that we run out of each gas at the same time.
The acetylene tank pressureTo solve this problem, we need to apply the ideal gas law:
PV = nRT
Applying the ideal gas law for each tank,
PV = NkT
where N is the number of particles, k is Boltzmann's constant, and T is the temperature.
For oxygen:
(155 atm) * (7.00 L)
= N1 * k * T
For acetylene:
(P2) * (2.00 L)
= N2 * k * T
To use up both gases at the same time, we need to use the same number of moles of each gas. So we can set N1 equal to N2:
N1 = N2
Combining the two equations above to solve for P2:
(155 atm) * (7.00 L) = (N1) * k * T
(P2) * (2.00 L) = (N1) * k * T
Dividing the second equation by the first,
P2/P1 = (2.00 L)/(7.00 L)
P2 = (2.00 L)/(7.00 L) * (155 atm)
P2 = 44.29 atm
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If I have 20 ml of 0.10 M acetic acid mixed with 15 ml of 0.10 M sodium acetate and 15 ml of water how do I find the pH?
The buffer solution has a pH of 5.36.
How to find pH?To find the pH of this buffer solution, use the Henderson-Hasselbalch equation:
pH = pKa + log([A⁻]/[HA])
where pKa = dissociation constant of acetic acid, [A⁻] = concentration of acetate ions, and [HA] = concentration of acetic acid.
Calculate the concentrations of acetate ions and acetic acid in the solution.
The initial moles of acetic acid are:
moles of acetic acid = volume of acetic acid x concentration of acetic acid
moles of acetic acid = 0.020 L x 0.10 mol/L
moles of acetic acid = 0.002 mol
After mixing with sodium acetate, the total volume of the solution is 50 mL, so the concentration of acetic acid and acetate ions are:
[HA] = moles of acetic acid / total volume of solution
[HA] = 0.002 mol / 0.050 L
[HA] = 0.040 M
[A⁻] = concentration of sodium acetate
[A⁻] = 0.10 M
The dissociation constant of acetic acid is pKa = 4.76.
Now, substitute these values into the Henderson-Hasselbalch equation:
pH = pKa + log([A⁻]/[HA])
pH = 4.76 + log(0.10/0.040)
pH = 4.76 + 0.60
pH = 5.36
Therefore, the pH of the buffer solution is 5.36.
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why mendeleev's periodic law is an important milestone in the study of chemistry. write any four reasons
Answer:
1. Organized information: Mendeleev's periodic law helped organize the then-disparate information about elements into a system that made sense. This made it easier for chemists to understand the nature of the elements and make predictions about their behavior.
(30 pts) Please find the correct answer.
What percent of the compound is made of Silver? *
Silver Nitrate, AgNO3?
Approximately 63.5% of the compound AgNO3 is made of silver.
The atomic mass of silver (Ag) is 107.87 g/mol, and the atomic mass of nitrogen (N) is 14.01 g/mol, and the atomic mass of oxygen (O) is 16.00 g/mol.
The molecular weight of AgNO3 is:
AgNO3 = (Ag atomic mass) + (N atomic mass) + (3 x O atomic mass)
AgNO3 = (107.87 g/mol) + (14.01 g/mol) + (3 x 16.00 g/mol)
AgNO3 = 169.87 g/mol
The percent by mass of silver in AgNO3 can be calculated as:
Percent by mass of silver = (Mass of silver / Total mass of AgNO3) x 100
Since there is only one silver atom in one AgNO3 molecule, the mass of silver in one mole of AgNO3 is equal to the atomic mass of silver, which is 107.87 g/mol.
Therefore, the percent by mass of silver in AgNO3 is:
Percent by mass of silver = (107.87 g/mol / 169.87 g/mol) x 100
Percent by mass of silver = 63.5%
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Question 2 (1 point)
Which is true for water?
It is a compound
It is an element
It is a chemical reaction
It is a metal