p [OH-] = -log[OH-]= -log ( 1x10^-11M) = 11
we know that
p[OH-] + p[H+] = 14
so p[H+] = 14- p[OH-] = 14- 11 = 3
pH = 3, answer
How many moles of ammonia gas are produced in the following reaction if 25 moles of nitrogen gas reacts with hydrogen?
Extra Content
N2(g) + 3H2(g). → 2NH3(g)
1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to produce 2 moles of ammonia gas
A.
100 moles
B.
25 moles
C.
50 moles
D.
75 moles
Answer:
I think b
Explanation:
50 moles of ammonia gas are produced in the following reaction if 25 moles of nitrogen gas reacts with hydrogen. Therefore, the correct option is option C.
What is moles?In the National System of Units, the mole represents the unit of substance amount. However many elementary units of a particular substance are present inside an object as well as sample is determined by the quantity of that material. There are precisely 6.022×10²³ elementary entities in a mole.
An elementary object may include an atom, any molecule, and ion, an ion pair, or perhaps a subatomic particle like an electron depending upon what the substance is.
N[tex]_2[/tex](g) + 3H[tex]_2[/tex](g). → 2NH[tex]_3[/tex](g)
moles of nitrogen = 25 moles
the mole ratio between nitrogen and ammonia is 1:2
moles of nitrogen = 25×2=50 moles
Therefore, the correct option is option C.
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What did Rutherford contribute to the model of the atom?
the neutron
the proton
the nucleus
the electron
Answer:
the nucleus
Explanation:
He proposed that the mass of an atom is concentrated in the nucleus which occupies a small volume in the center .He added that the nucleus comprises the protons and neutrons.where the neutron had no charge while the protons had charge of +1
Answer:
the nucleus
Explanation:
According to the Gibbs free energy equation, G= H-T S, when could a high temperature make a reaction that was nonspontaneous at low temperature spontaneous
Answer:
For the reaction to be spontaneous at high temperatures, ΔG < 0 and, ΔH > 0 and ΔS > 0.
Explanation:
According to the Gibbs free energy equation, for the reaction to be spontaneous at high temperatures when it was not spontaneous at low temperatures, the free energy change ΔG < 0.
Since ΔG = ΔH - TΔS where ΔH = enthalpy change and ΔS = entropy change,
For ΔG < 0 at high temperatures, ΔH > 0 and ΔS > 0. That is both ΔH and ΔS are positive at high temperatures.
So, for the reaction to be spontaneous at high temperatures, ΔG < 0, and ΔH > 0 and ΔS > 0.
When ΔH and ΔS are both positive
Which lunar phase is 21 days after the first quarter?
Answer: waning gibbous
Explanation:
URGENT ! PLEASE ANSWER QUICKLY
Calculate the volume of a NaCl solution that would contain 5.0 g of NaCl and have a molarity of 4.8 M.
Calculate the pH for a solution with a 4.6 x 10-9 M hydronium concentration.
Answer:If we dissolve NaF in water, we get the following equilibrium:
text{F}^-(aq)+text{H}_2text{O}(l) rightleftarrows text{HF}(aq)+text{OH}^-(aq)
The pH of the resulting solution can be determined if the K_b of the fluoride ion is known.
20.0 g of sodium fluoride is dissolve in enough water to make 500.0 mL of solution. Calculate the pH of the solution. The K_b of the fluoride ion is 1.4 × 10 −11 .
Step 1: List the known values and plan the problem.
Known
mass NaF = 20.0 g
molar mass NaF = 41.99 g/mol
volume solution = 0.500 L
K_b of F – = 1.4 × 10 −11
Unknown
pH of solution = ?
The molarity of the F − solution can be calculated from the mass, molar mass, and solution volume. Since NaF completely dissociates, the molarity of the NaF is equal to the molarity of the F − ion. An ICE Table (below) can be used to calculate the concentration of OH − produced and then the pH of the solution.
Explanation:
Answer:
not sure if this is 100% correct but this is what i got first question: molarity=mol/L 5g*1mol/58.44g=5/58.44 =0.085558mol 4.8m=0.085558/L L=0.0178
jiujuan avatar
second question: pH = - log [H3O+] pH= -log [4.6*10^-9] = 8.33724216
Explanation:
Solve for 1. Enter the solutions from least to greates (x + 3)2 - 4= 0 lesser ,greater
Answer:
Explanation:
If you would like to solve 1/(x + 3) = (x + 10)/(x - 2), you can do this using the following steps:
1/(x + 3) = (x + 10)/(x - 2)
1 * (x - 2) = (x + 10) * (x + 3)
x - 2 = x^2 + 3x + 10x + 30
0 = x^2 + 13x + 30 - x + 2
0 = x^2 + 12x + 32
0 = (x + 8) * (x + 4)
1. x = -8
2. x = -4
what happen to water when it boils
When water is boiled, the heat energy is transferred to the molecules of water, which begin to move more quickly. Eventually, the molecules have too much energy to stay connected as a liquid. When this occurs, they form gaseous molecules of water vapor, which float to the surface as bubbles and travel into the air.
Which of these statements describes a difference between the mechanics of
airplane flight and rocket flight?
A. Airplanes must carry an oxidizer along with fuel.
B. Airplanes need only upward thrust as a force for flight.
C. Rockets need only upward thrust as a force for flight.
D. Rockets need air molecules from the atmosphere to generate
thrust
Answer:
C. Rockets need only upward thrust as a force for flight.
Explanation:
This is correct
Answer:
c
Explanation:
a bottle with a volume of 694 L contains how many moles of O2 gas at STP
Answer:
Solution given:
22.4 liter of O2=1 mole of O2
694litre of O2=[tex] \frac{1}{22.4} \times 694[/tex]
=30.98or 31 mole of O2
what is 1 mol / 66.04g
Answer:
15.142338 mol/kg
Explanation:
(1 mole) / (66.04 grams)
Mass of Material
in Beaker
350.0 g
Initial Temperature
419°C
Final Temperature
30.9°C
Using the specic heat and the mass of the water, Camille
calculated that the water absorbed 16.4 kJ of heat. What is
the specific heat of the liquid in the beaker?
Select one
O4260
o 1800 kg
O 3850 kg
O 7570
a gas measured a volume 100 mL under pressure of 740 mmHg. What would the volume be under a pressure of 780 mmHg with constant temperature
Answer:
94.87 mLExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{100 \times 740}{780} = \frac{74000}{780} \\ = 94.8717...[/tex]
We have the final answer as
94.87 mLHope this helps you
Suppose that the student took one more volume
reading of 24.2 mL but forgot to measure the
pressure.
Compute the pressure expected for that
volume. kg/cm2?
Answer:
2.13 Kg/cm².
Explanation:
We'll begin by calculating the constant that exist between the pressure and the volume. This can be obtained by using the Boyle's law equation as shown below.
Boyle's law states that
PV = K
Where
P is the pressure.
V is the volume.
K is the constant.
We shall determine the value of K as follow:
Pressure (P) = 1.15 Kg/cm²
Volume (V) = 44.8 mL
Constant (K) =?
PV = K
1.15 × 44.8 = K
K = 51.52 Kg/cm²•mL
Finally, we shall determine pressure, when the volume is 24.2 mL. This can be obtained as follow:
Volume (V) = 24.2 mL
Constant (K) = 51.52 Kg/cm²•mL
Pressure (P) =?
PV = K
P × 24.2 = 51.52
Divide both side by 24.2
P = 51.52 / 24.2
P = 2.13 Kg/cm²
Therefore, the pressure is 2.13 Kg/cm².
is ice dissolving in a glass of lemonade a chemical change
What type of energy transfer takes place when music is coming out of a speaker?
A gas has a pressure of 50.0 mm Hg at 540 K. What is the pressure at 200.0 K if there is no volume change? *
17.0 mmHg
18.5 mmHg
19 mmHg
22.5 mmHg
If you have 0.50 L of 0.45 M sodium bromide. How many grams of sodium bromide are present?
Answer:
23.175g
Explanation:
0.45 mole of NaBr is in 1 liter
? moles of NaBr is in 0.50 liter
0.50 × 0.45 = 0.225 of NaBr
1 mole of NaBr = 23 + 80 = 103g
0.225 moles of NaBr = ?
0.225 × 103 = 23.175g
What type of waves is produced by moving or vibrating objects
Answer:
Mechanical Sound Waves
A mechanical wave is a wave that depends on the oscillation of matter, meaning that it transfers energy through a medium to propagate. These waves require an initial energy input that then travels through the medium until the initial energy is effectively transferred. Examples of mechanical waves in nature include water waves, sound waves, seismic waves and internal water waves, which occur due to density differences in a body of water. There are three types of mechanical waves: transverse waves, longitudinal waves, and surface waves.
Why is sound a mechanical wave? Sound waves move through air by displacing air particles in a chain reaction. As one particle is displaced from its equilibrium position, it pushes or pulls on neighboring molecules, causing them to be displaced from their equilibrium. As particles continue to displace one another with mechanical vibrations, the disturbance is transported throughout the medium. These particle-to-particle, mechanical vibrations of sound conductance qualify sound waves as mechanical waves. Sound energy, or energy associated with the vibrations created by a vibrating source, requires a medium to travel, which makes sound energy a mechanical wave.
https://www.pasco.com/products/guides/sound-waves
this website tech you about wave, so learn it!!!
Please someone help ! I need it ASAP
Answer:
6.B
7.B
Explanation:
Mark me as brainliest
What is a practically insignificant reaction?
Answer:
Practical significance refers to the magnitude of the difference, which is known as the effect size. Results are practically significant when the difference is large enough to be meaningful in real life. ... Very small differences will be statistically significant with a very large sample size.
Explanation:
Hope it helps
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Which organelle stores the information that determines an individual blood type
Answer:organelle 1
Explanation:
Organulo 1 is the organelle that stores the information that determines an individual blood type. The correct option is option A.
What is organelle?A tiny cellular component known as an organelle serves a specialised purpose within a cell. The cytoplasm of prokaryotic and eukaryotic cells contains organelles. Organelles are frequently encased by a separate membrane in eukaryotic cells because they are more complicated.
Similar to the internal organs of the body, organelles are specialised and carry out important tasks required for proper cellular function. Organelles are responsible for a variety of tasks, such as powering a cell's energy needs and regulating its development and reproduction. Organulo 1 is the organelle that stores the information that determines an individual blood type.
Therefore, Organulo 1 is the organelle that stores the information that determines an individual blood type. The correct option is option A.
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Your question is incomplete but most probably your full question was,
What is the net ionic equation for ammonium carbonate and barium nitrate?
Speed is the rate of change of position expressed as _____ traveled per unit of time. A. direction B. meter C. displacement D. distance... Help!!!
Answer:
Speed is the rate of change of position expressed as distance travelled per unit of time .
Explanation:
How many grams of CaCl2 should be dissolved in 445.2 mL of water to make a 0.19 M solution of CaCl2?
In order to solve this, you will need to know how many moles of CaCl2 you will need, and to do so, you must look at the concentration of the solution.
You are told that the concentration of the solution is 0.19M, meaning that there is 0.19 moles of CaCl2 for every 1 liter of solution. However, you don't have 1 liter of solution, you have 445.2 mL. You must convert this to liters by dividing by 1000.
445.2 mL * (1 L / 1000 mL) = 0.4452 L
Now, you can solve for how many moles the solution must have. Since M = mol / L and you are given M and L, you can set up an equality as follows:
0.19M = mol / 0.4452 L
Now, in order to find the number of moles, you multiply both sides by 0.4452L
0.19M * 0.4452 L = moles = 0.084588mol
Now, you must calculate the molar mass of CaCl2 by using the periodic table
MM Ca = 40.078 g/mol
MM Cl = 35.452 g/mol
40.078 + (35.452 * 2) = 110.982 g/mol
Now you multiply the number of moles in the solution you calculated by the molar mass.
0.084588mol * 110.982 g/mol = 9.387 g CaCl2
1: At which temperature would a reaction withΔH = -102 kJ/mol, ΔS = -0.188 kJ/(mol×K) be spontaneous? 2: At which temperature would a reaction withΔH = 132 kJ/mol, ΔS = 0.200 kJ/(mol×K) be spontaneous?
Answer:
1: At temperatures below 542.55 K
2: At temperatures above 660 K
Explanation:
Hello there!
In this case, according to the thermodynamic definition of the Gibbs free energy, it is possible to write the following expression:
[tex]\Delta G=\Delta H-T\Delta S[/tex]
Whereas ΔG=0 for the spontaneous transition. In such a way, we proceed as follows:
1:
[tex]0=\Delta H-T\Delta S\\\\T=\frac{-102kJ/mol}{-0.188kJ/mol-K} \\\\T=542.55K[/tex]
It means that at temperatures lower than 542.55 K the reaction will be spontaneous.
2:
[tex]0=\Delta H-T\Delta S\\\\T=\frac{132kJ/mol}{0.200kJ/mol-K} \\\\T=660K[/tex]
It means that at temperatures higher than 660 K the reaction will be spontaneous.
Best regards!
The difference between a conjugate acid/base pair is
+
o the conjugate acid
o the conjugate base
O one proton
one OH-
Answer:
hola no ablo inglés porfavor
How many calories of heat were added to 167.9 g of water to raise its temperature from 25oC to 55oC?
Answer:
Q = 5036.9 calories
Explanation:
Given that,
Mass, m = 167.9 g
The temperature raises from 25°C to 55°C.
The specific heat of water,c = 4.184 J/g °C
We need to find the heat added to water. We know that,
[tex]Q=mc\Delta T\\\\=167.9 \times 4.184\times (55-25)\\\\=21074.8\ J[/tex]
or
Q = 5036.9 calories
So, 5036.9 calories of heat is added.
Which functional group does the molecule below contain
H
H-C-C
H
H
A. Carbonyl
B. Hydroxyl
Amino
D. Ether
The functional group to which the molecule belongs is the carbonyl group.
What is a functional group?A functional group refers to an atom, group of atoms or bond which is responsible for the chemical reactivity of a particular homologous series.
From the image of the molecule that has been shown in the question, the functional group to which the molecule belongs is the carbonyl group.
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Answer:
A
Explanation:
got it right in app filler filler filler filler
A meander is _____.
A. an erosional feature that causes additional sediment to enter the river
B. the beginning of a mountain
C. a curve in a river
D. a depositional feature formed by moving water
Para saber si se lleva a cabo una reacción donde un metal desplaza a otro metal de su sal u otro compuesto, es preciso:
Answer:
Explanation:
¡Hola!
En este caso, dado que las reacciones de desplazamiento simple se llevan a cabo cuando un metal desplaza a otro metal de su sal u otro compuesto, es preciso tener en cuenta la serie de reactividad de los metales que se muestra en el archivo adjunto.
Así, es mandatorio que el metal con el que la sal original reacciona, sea más reactivo que el catión de la misma, de modo contrario, la reacción tendría lugar. Por ejemplo, si el sodio reacciona con cloruro de zinc, al este primero estar más arriba en la serie, quiere decir que es capaz de desplazar el zinc en el cloruro original y así se formaría zinc metálico y cloruro de sodio.
¡Saludos!