Answer:
349 L (To 3 significant figures)
Explanation:
The reaction equation is;
C9H20(l) + 14O2(g) ------> 9CO2(g) + 10H2O(g)
number of moles of nonane in 0.210 Kg = mass/molar mass
molar mass of nonane = 9(12) + 20(1) = 128 gmol-1
Hence number of moles = 0.210 * 10^3g/128 gmol-1 = 1.64 moles
If 1 mole of nonane produced 9 moles of CO2 from the balanced reaction equation;
1.64 moles of nonane will produce 1.64 * 9/1 = 14.76 moles of CO2
Now from the ideal gas equation;
PV=nRT
P = 1 atm
V= the unknown
n= 14.76
R = 0.082 atmLmol-1K-1
T = 15 + 273 = 288 K
V= nRT/P
V = 14.76 * 0.082 * 288/1
V = 348.57 L
500 cc of 2N Na2CO3 are mixed with 400 cc of 3N H2SO4 and volume was diluted to one litre. Will the resulting solutiomacidic,basic or neutral?Also calculate the molarity of the dilute solution.
Answer:
Given info : 500 cc of 2N Na2CO3 are mixed with 400 cc of 3N H2SO4 and volume was diluted to one litre. To find : will the resulting solution is acidic , basic or neutral ? Calculate the molarity of the dilute solution. solution : no of moles of Na2CO3 = normality/n %3D - factor x volume 2/2 x 500/1000 = 0.5 mol %D no of moles of H2SO4 = 3/2 x 400/100O = 0.6 mol %3D We see, Na2CO3 + H2S04 => Na2S04 + CO2 + H2O Here one mol of Na2C03 reacts with one mole of H2SO4. So, 0.5 mol of Na2CO3 reacts with 0.5 mol of H2SO4. so, remaining 0.1 mol of H2SO4 makes solution acidic. Now molarity of solution = remaining no of moles of H2SO4/volume of solution= 0.1/1 = %3D 0.1M
"When 500 cc of 2N [tex]Na_{2}CO_{3}[/tex] is mixed with the 400 cc of 3N [tex]H_{2} SO_{4}[/tex] and volume was diluted to one liter then solution will be acidic and molarity will be 0.55 mol"
What is Molarity?
The molar concentration of a chemical species, specifically a solute in a solution, is measured in terms of the amount of material per unit volume of solution.
It is given that normality of [tex]Na_{2}CO_{3}[/tex] is 2 and [tex]H_{2} SO_{4}[/tex] is 3. It can be written in term of molarity like, the molarity of [tex]Na_{2}CO_{3}[/tex] is 0.1 M and molarity of [tex]H_{2} SO_{4}[/tex] is 1.5 M.
Now calculate the number of moles in [tex]Na_{2}CO_{3}[/tex]
For [tex]Na_{2}CO_{3}[/tex] = 500 cc / 1000 cc/L ×0.1 mol/L =0.05 mol.
For [tex]H_{2} SO_{4}[/tex] = 400 cc/ 1000 cc/L × 1.5mol /L = 0.60 mol.
It can be said that 0.05 mol reacts with 0.05 mol [tex]H_{2} SO_{4}[/tex] .
Now calculate the molarity of [tex]H_{2} SO_{4}[/tex] solution= 0.55 mol /L = 0.55 mol.
Hence, remaining 0.1 mol solution will make acidic.
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Of the metal ions tested, sodium produces the brightest and most persistent color in the flame. Do you think potassium could be detected visually in the presence of sodium by burning this mixture in a flame
When sodium is present, it is challenging to distinguish potassium because sodium causes the flame to have the most vivid and lasting color.
Spectra of Sodium and PotassiumSodium should be absent if we wish to distinguish the coloration of other metals. In the absence of sodium, potassium tints the flame violet. However, we were able to identify the existence of both ions using a spectroscope. Only a few brightly colored lines in the spectrum can be detected when the light produced by an element's atoms is observed in a spectroscope.
A given excited atom may only undergo energy changes of specific fixed, definite amounts, as evidenced by the fact that it only emits radiation at a limited set of fixed wavelengths.
These ions' emission spectra can be seen to consist of a number of lines when we use a spectroscope to look at them. Each metal's series is distinct. In contrast to sodium, potassium has a distinctive set of lines. Thus, both are distinguishable from one another.
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a human skull is ?????
Answer:
part of the skeleton that supports the structure of face and forms a cavity from bone.
Hope it help u.
Explanation:
hope it is helpful to you
. The earth’s diameter is 1.276 x 107 meters. How many yards is this?
Answer:
1.396 x [tex]10^{7}[/tex] yards
Explanation:
The Earth has a spherical shape, thus its diameter is a straight line that passes through its center; dividing into two equal halves.
Given that the diameter of the earth is 1.276 x [tex]10^{7}[/tex] meters.
But,
1 meter = 1.09361 yards
So that,
1.276 x [tex]10^{7}[/tex] meters = x
⇒ x = 1.276 x [tex]10^{7}[/tex] x 1.09361
= 1.39545 x [tex]10^{7}[/tex] yards
The diameter of the earth is 1.396 x [tex]10^{7}[/tex] yards.
Which of the following best defines climate)_( Short-term atmospheric conditions of a region Ob The weather pattern of an area over two weeks or less Average weather conditions of a region over the long term Od A pattern of weather that never changes
Answer:
Average weather conditions of a region over the long term
Explanation:
Climate is the long-term average of weather, typically averaged over a period of 30 years. More rigorously, it denotes the mean and variability of meteorological variables over a time spanning from months to millions of years.
What is the pH of a 0.164 M monoprotic acid whose Ka is 9.217 × 10−3?
Answer:
The pH of the solution is 1.68.
Explanation:
Hope this helped!
what does the word "local" mean
Answer:
belonging or relating to a particular area or neighborhood, typically exclusively so
Explanation:
A solution is made by dissolving
37.5 g of sodium sulfide (Na2S) in
217 g of water.
What is the molality of the solution?
Answer:
2.21m
Explanation:
Molality, m, is defined as the ratio between moles of solute (The substance that is in less amount, sodium sulfide) and kilograms of solvent (Water, in this case).
Thus, we need to convert mass of sodium sulfide to moles using its molar mass and grams of water to kilograms:
Moles Na2S (Molar mass: 78.0452g/mol):
37.5g * (1mol / 78.0452g) = 0.48 moles Na2S
Kilograms water:
217g * (1kg / 1000g) = 0.217kg
Molality:
0.48 moles Na2S / 0.217kg =
2.21mAnswer:
2.21
Explanation:
Using the same sample of gas (P1 = 605 torr , T1 = 20 ∘C ), we wish to change the pressure to 6050 torr with no accompanying change in volume or amount of gas. What temperature T2, in Celsius, is needed to reach this pressure?
Temperature to reach the pressure : 2657 °C
Further explanationGay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
P₁=605 torr
T₁=20 + 273 = 293 K
P₂=6050 torr
[tex]\tt T_2=\dfrac{T_i\times P_2}{P_1}\\\\T_2=\dfrac{293\times 6050}{605}\\\\T_2=2930~K=2657~^oC[/tex]
A 45.0 mL solution of 0.0450 M hydroxylamine is extracted with 125 mL of solvent. The distribution constant for the reaction is 5.00 and the pKa of the protonated form of hydroxylamine is 5.960. Calculate the concentration of hydroxylamine remaining in the aqueous phase at pH=4.50 and pH=6.50 .
Answer:
pH = 4.5, concentration = 0.045 M.
pH = 6.5, concentration = 0.175 M.
Explanation:
The ka for the can be calculated by using the formula below;
Ka = 10^-pka = 10^-5.960 = 1.1 × 10^-6
The concentration of hydrogen ion at pH = 4.50 can be calculated as given below;
{H^+ } = 10^-4.50 = 3.2 × 10^-5 M.
(NB=> 10 in this regards means the inverse of log).
The next step is to determine the distribution coefficient which can be calculated by using the formula below;
distribution coefficient = (partition coefficient) × ka / ka + ( concentration of Hydrogen ion,H^+).
distribution coefficient =( 5 × 1.1 × 10^-6 ) / 1.1 × 10^-6 + 3.2 × 10^-5 M. = 5.5 × 10^-6/ 3.2 = 0.00000171875
The fraction remaining from the compound = 45.0 mL / 45.0 mL + (0.00000171875 × 125).
= 0.999995.
Thus, the concentration at pH = 4.5 = 0.999995 × 0.0450 M = 0.045 M
(B). pH=6.50, thus the concentration of Hydrogen ion = 10^-6.5 = 3.2 × 10^-7 M.
distribution coefficient = (partition coefficient) × ka / ka + ( concentration of Hydrogen ion,H^+).
distribution coefficient = (5 × 1.1 × 10^-6)/ 1.1 × 10^-6 + 3.2 × 10^-7 M).
distribution coefficient = 5.5 × 10^-6/ 1.42 × 10^-6 = 3.9.
Therefore, the concentration = 3.9 × 0.0450 M = 0.175 M.
Select the atomic models that belong to the same element.
Answer:
top right and bottom left
Explanation:
just took test plato/edmentum
What is the effect of convection in the mantle on earths land formations?
Answer:
As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.
Mr. Juan is husband of Maria, before they get married Maria knows that her husband cannot make a baby since he cant produce sperm. But during their 2 years in marriage, Maria got pregnant. Is Juan can file a case to Maria? What it is? Support your answer?
Answer:
yes but first he need to check himself
Explanation:
bcoz if he cannot produce a sperm than she might have cheated him and the baby might be of someone other.
Assume a density of water of 1.00 g/mL, and calculate the mass of water in the solution
Answer:
1g or 10^-3kg
Explanation:
as you know , the density =mass \volume
so you have the mass from the number it self
[tex]\frac{1g}{1 ml}[/tex] so from this equation, you will get 1 g and you can to SI to be [tex]10^{-3}[/tex]kg20.
Which of the following is an example of an analgesic?
- Aspirin
- Insulin
- Penicillin
- Cortisone
Answer:
Aspirin which is also considered as
NSAID
Explanation:
they are prescribed drugs
Among the given examples, aspirin is an example of an analgesic. The correct answer is option a.
Analgesics are a class of drugs that are used to relieve pain.
Aspirin is a non-steroidal anti-inflammatory drug (NSAID) that works by inhibiting the production of prostaglandins, which are chemicals in the body that cause pain and inflammation.
Aspirin is commonly used to treat mild to moderate pain, such as headaches, toothaches, and menstrual cramps. In addition to its analgesic properties, aspirin is also used as an anti-inflammatory and antipyretic (fever-reducing) agent.Therefore, the example of an analgesic is aspirin that is commonly used to relieve pain. Option a is the correct answer.
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A 0.2 g sample of pyrolusite is analyzed for manganese content as follows. Add 50.0 mL of 0.1 M solution of ferrous ammonium sulfate to reduce the MnO2 to Mn2 . After reduction is complete, the excess ferrous ion is titrated in acid solution with 0.02 M KMnO4, requiring 15.0 mL. Calculate the percent manganese in the sample as Mn3O4.
Answer:
66.7%
Explanation:
The reaction for the titration of the excess ferrous ion is:
5Fe⁺² + MnO₄⁻ + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂OWe calculate the moles of Fe⁺² from the used moles of KMnO₄:
0.02 M * 15.0 mL = 0.30 mmol KMnO₄0.3 mmol KMnO₄ * [tex]\frac{5mmolFe^{+2}}{1mmolKMnO_4}[/tex] = 1.5 mmol Fe⁺²Then we substract those 0.30 mmol from the original amount used:
0.1 M * 50.0 mL = 5.0 mmol Fe⁺²5.0 - 1.5 = 3.5 mmol Fe⁺²The reaction between ferrous ammonium sulfate and MnO₂ is:
2Fe⁺² + MnO₂ + 4H⁺ → 2Fe³⁺ + Mn²⁺ + 2H₂OSo we convert those 3.5 mmol Fe⁺² that were used in this reaction to MnO₂ moles:
3.5 mmol Fe⁺² * [tex]\frac{1mmolMnO_2}{2mmolFe^{+2}}[/tex]= 1.75 mmol MnO₂Then we convert MnO₂ to Mn₃O₄, using the reaction:
3MnO₂ → Mn₃O₄ + O₂1.75 mmol MnO₂ * [tex]\frac{1mmolMn_3O_4}{3mmolMnO_2}[/tex] = 0.583 mmol Mn₃O₄Finally we convert Mn₃O₄ moles to grams:
0.583 mmol Mn₃O₄ * 228.82 mg/mmol = 133.40 mg Mn₃O₄And calculate the percent
0.2 g = 200 mg133.40 / 200 * 100% = 66.7%Write two advantages and two disadvantage of hydrogen
Module 1 Exam
Elicia
Chemistry A -
9. Water at which of the following temperatures would have particles with the greatest average kinetic energy?
O 50°C
O 100°C
O 10°C
0°C
Answer:
100°C
Explanation:
The higher temperature causes the molecules to increase in speed, and kinetic energy is greatest in the gas phase.
A cleaning product company is having trouble with the phi control of one of their products. The prod basic but the pH is too high What could the company try to correct the pH of the product? A. Increasing the amount of product in each container B. Diluting the contents of each container by adding water C. Allowing some water to evaporate from each container D. Adding drain cleaner from this activity to each container (tts)
Answer:
Option B.
Explanation:
Obviously, a cleaning agent companies is going to be a producer of cleaning agents which are chemical substance which are used for the main purpose of removing unwanted particles (dirt).
For this particular Question, option ''B'' is correct because upon the addition of H2O, there will surely be changes in the numbers of ions in the cleaning agents.
From the Question above, we have that the cleaning agents has pH which is too high, therefore in order to reduce the pH of the cleaning agents, water will be used to mix the product or cleaning agents. Upon the addition of water there will be decrease in OH^-.
how to differentiate between methane and ethene gas
A 50.0 mL solution of Ba(OH)2 is combined with a 150 mL solution of 0.20 M HCl. If the resulting solution has a hydroxide ion concentration of 0.12 M, what was the concentration of Ba(OH)2 in the original solution?
Answer:
0.54M of Ba(OH)2
Explanation:
When Ba(OH)2 reacts with HCl, BaCl2 and H2O are produced as follows:
Ba(OH)2 + 2HCl → BaCl2 + 2H2O
The remanent hydroxide ion is because not all Ba(OH)2 reacts. Thus, we need to find moles of Ba(OH)2 that doesn't react and moles of Ba(OH)2 that reacts. The ratio between total moles and volume of the Ba(OH)2 solution = 0.050L is the molarity of the original solution
Moles of Ba(OH)2 that doesn't react:
50mL + 150mL = 0.200L * (0.12 mol OH- / L) = 0.024 moles OH-
2 moles of OH- are in 1 mole of Ba(OH)2:
0.024 moles OH- * (1mol Ba(OH)2 / 2 mol OH-) = 0.012 moles Ba(OH)2
Moles of Ba(OH)2 that react:
0.150L * (0.20mol / L) = 0.030 moles HCl
2 moles of HCl react per mole of Ba(OH)2:
0.030 moles HCl * (1mol Ba(OH)2 / 2 mol HCl) = 0.015 moles Ba(OH)2
Total moles:
0.012mol + 0.015mol = 0.027mol Ba(OH)2 in 50mL
0.027mol Ba(OH)2 / 0.0500L =
0.54M of Ba(OH)2
What evidence would a scientist use to determine the age of rock in a layer?
Answer: They can find fossils and use a technology called radiocarbon to find the age of the fossil and then do an approximate about the age of the rock.
Explanation:
A solution containing HCI would likely have
a high pH and a low pOH.
a low pH and a high pH.
a high pH and a high poH.
a low pH and a low poH
Answer:
B on EDGE 2021
Explanation:
THE ANSWER ABOVE IS INCORRECT brainliest pls?
Given the solution containing HCl, the solution is likely to have a low pH and a high poH
What is pH ?This is simply a measure of the acidity / alkalinity of a solution.
The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration
pH scaleThe pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.
The scale ranges from 0 to 14 indicating:
0 to 6 indicates acid 7 indicates neutral 8 to 14 indicate basicHowever, it should be noted that as the pH increases, pOH decreases and as pH decreases, pOH increases.
Considering the question given above, the solution (HCl) is acidic.
Therefore, the solution will have a low pH and a high pOH
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A weather balloon with a volume of 3.40774 L
is released from Earth’s surface at sea level.
What volume will the balloon occupy at an
altitude of 20.0 km, where the air pressure is
10 kPa?
Answer in units of L.
Answer: The volume occupied at an altitude of 20.0 km is 34.5289 L
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
where,
[tex]P_1[/tex] = initial pressure of gas = 101.325 kPa ( sea level)
[tex]P_2[/tex] = final pressure of gas = 10 kPa
[tex]V_1[/tex] = initial volume of gas = 3.40774 L
[tex]V_2[/tex] = final volume of gas = ?
Now put all the given values in the above equation, we get the final pressure of gas.
[tex]101.325\times 3.40774=10\times V_2[/tex]
[tex]V_2=34.5289L[/tex]
Therefore, the volume occupied at an altitude of 20.0 km is 34.5289 L
which charcoal Is used as gas mark absorbent
Answer:
where is the answers at
Explanation:
A system includes:
а
objects that are interacting.
B the surrounding air.
C the surface or medium on which the objects rest.
D all of the above.
The properties of compund are different from the properties of their constituenr
Answer: Atoms of carbon and hydrogen
Explanation:
How are changes of state different from chemical change?
Question:
How are changes of state different from chemical change?
Answer:
Physical changes alter only the size, shape, form or matter state of a material. Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes.
On the other hand, chemical changes are a bit different. In a chemical change, a new substance is formed.
Answer:
Chemical change happens when a substance changes they molecular structure, it often involves change in color (rusting iron), transfer of energy (copper smelting), or gas bubbling.
Changes of state is a physical change. An example is ice, it melts to create water. Water then can be freezed back to ice. Water is still H2O in both states（solid/liquid) Dissovling is another example. You can dissolve salt in water and can separate it by evaporating water and leaving the salt behind.
Explanation:
Rank the following from least to greatest electron affinity: Carbon (C), Nitrogen (N), Oxygen (O).
Group of answer choices
O < N < C
C < N < O
N < C < O
C < O < N
Answer:
C < N < O.
Explanation:
Hello!
In this case, since the electron affinity is a periodic property of elements indicating how likely is for the element to gain one electron, which is also related to the electronegativity, we can notice that fluorine is the most electronegative element or also, the element with the highest electron affinity whereas francium is the least electronegative element.
Therefore, we can infer that the electron affinity or electronegativity, increases from left to right and from bottom to top in the periodic table, it means that among carbon, nitrogen and oxygen, the element with the greatest electron affinity is oxygen, then nitrogen and finally carbon with the least one, thus answer is C < N < O.
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How does temperature effect the molecules of a substance that is dissolved.
Explanation:
Generally, temperature increases the rate of any chemical reaction considerably.
In a dissolution process, the solute is solvated in the solvent. Solutes are usually the solids or liquids being dissolved in the solution.
When temperature increases, the average kinetic energy of the solvent molecules increase also. The indicator of the average kinetic energy in a body is heat. As molecules begins to move rapidly, it brings both the solvent and solute in contact faster with each other.