xác định nội năng chuẩn ΔU của phản ứng tổng hợp amoniac
ở 400 0 C, biết :
N 2(k) + 3H 2(k) = 2NH 3(k) ΔH 0 T = - 109,0 kJ
Answers
Explanation:
xác định nội năng chuẩn ΔU của phản ứng tổng hợp amoniac
ở 400 0 C, biết :
N 2(k) + 3H 2(k) = 2NH 3(k) ΔH 0 T = - 109,0 kJ
Related Questions
which of the following statements concerning a solution is not true? multiple choice a solution is likely to form when the solute(s) and the solvent have similar polarities. a solution contains particles that are smaller in size than those of colloids and suspensions. a solution has its components uniformly distributed. a solution is composed of a solvent and one or more solutes; the solute(s) dissolve in the solvent. a solution is a heterogeneous mixture of two or more pure substances.
Answers
a. solution is a heterogeneous mixture of two or more pure substances.
A solution is a type of mixture in which one or more substances, called solutes, are dissolved in a solvent to form a homogeneous mixture. Solutes are evenly distributed throughout the solvent, forming a homogeneous mixture. This means that the solution has the same concentration of solutes throughout.
For example, when sugar is dissolved in water, the sugar particles dissolve and distribute evenly throughout the water. Sugar and water form a homogeneous mixture and the sugar particles are too small to be seen individually.
All other statements are true. A solution is a homogeneous mixture of one or more solutes and a solvent in which the solutes are evenly distributed throughout the solvent. A solute dissolves in a solvent to form a homogeneous mixture. Particles in solution are smaller than those in colloids and suspensions. If the solute and solvent have similar polarities, they are more likely to dissolve and form a solution.
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Round your answer to the correct number of significant figures or decimal places: 0.005-0.0007=
Answers
Answer:
0.0043
0.004 if to one significant figure
0 to one decimal place.
Who is credited with arranging the periodic table?.
Answers
Russian chemist Dmitri Mendeleev
If 64 grams of O2 is at a volume of 17L, how many moles will it occupy at 12 L.
___moles
Answers
Answer:
Explanation:
17L - 64grams
12L - x grams (where x = mass at 12L)
X = \(\frac{12*64}{17}\)
x = \(\frac{768}{17}\)
x = 45.2g
moles,n = mass,m/ molar mass
molar mass of O2 = 16*2 = 32
moles, n = \(\frac{45.2}{32}\)
moles, n = 1.4125 mol
Therefore O2 occupys 1.4125moles at 12L
how many sulfate ions are there in 321 grams of iron lll sulfate
Answers
Of course, the mole specifies a much larger quantity, and if I have a mole of stuff then I have
6.022
×
10
23
individual items of that stuff. We can also specify an equivalent mass, because we also know the mass of a mole of iron, and a mole of oxygen etc........The mole is thus the link between the macro world of grams and kilograms and litres, that which we can measure out in the lab, to the micro world of atoms, and molecules, that which we can perceive only indirectly.
Here we have the formula unit
F
e
2
(
S
O
4
)
3
. If there is a mole of formula units, there are necessarily 2 moles of iron atoms, 3 sulfate ions,.......etc.
A steam engine depends on what kind of energy conversation
Answers
Answer:
mechanical energy
write an equation for the reaction between nitrogen (ii) oxide and iron (ii) sulphide
Answers
Answer:
Let us write down the reaction equations for inorganic substances:
N2 + 3H2 = 2NH3 – redox reaction (ORR), ammonia was obtained;
4NH3 + 5O2 = 4NO + 6H2O – ОВР, nitrogen oxide was formed (2);
2NO + O2 = 2NO2 – ОВР, nitrogen oxide was released (4);
H2O + 2NO2 = HNO3 + HNO2 – OBP, nitric acid obtained;
2HNO3 + PbO = Pb (NO3) 2 + H2O – ion exchange, lead nitrate was formed;
2Pb (NO3) 2 = 2PbO + 4NO2 + O2 – OBP, oxygen was obtained.
The reaction products are of practical importance, for example, lead nitrate is the basis for obtaining pigments necessary for dyeing fabrics in the textile industry. These reactions show the connection of non-metals, hydrides, oxides, acids, salts.
Select the correct answer from the drop-down menu.
Photograph shows a mushroom shaped cloud of volcanic ash.
(blank) is the most likely resource to be found near the base of a volcano on Earth’s surface.
Answers
metal ore
i got this question before and answered this one correctly trust me its right
Answer:
metal ore
Explanation:
In the lab, a bottle is found with a deteriorated label. A concentration of 0.25 M and the word acid can be read out, but the name of the acid cannot. You determine that the solution has a [H 3 O+] =3.81×10 −4 M. What is the K a of the unknown acid?
Answers
The Kₐ of the unknown acid is 3.81×\(10^{-4}\).
To determine the Kₐ (acid dissociation constant) of the unknown acid, we can use the concentration of [H₃O⁺] in the solution. The Kₐ value represents the extent of acid dissociation in water.
The equation for the dissociation of an acid HA is as follows:
HA ⇌ H⁺ + A⁻
The Kₐ expression for this equilibrium is:
Kₐ = [H⁺][A⁻] / [HA]
In this case, we have the concentration of [H₃O⁺] as 3.81×\(10^{-4}\)M, which is equivalent to [H⁺].
Since the unknown acid is a monoprotic acid (forms only one H⁺ ion), the concentration of [A⁻] is equal to the concentration of the acid itself [HA]. Therefore, we can substitute [A⁻] and [HA] with the concentration of the acid in the Kₐ expression.
Given that the concentration of the acid is 0.25 M, we have:
Kₐ = (3.81×\(10^{-4}\) M * 0.25 M) / (0.25 M)
Simplifying the expression:
Kₐ = 3.81×\(10^{-4}\)
Therefore, the Kₐ of the unknown acid is 3.81×\(10^{-4}\).
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What does it mean when a cell is multicellular?
options:
A.) Multicellular organisms are simple. They contain cytoplasm, ribosomes, DNA and a cell membrane
B.) Multicellular organisms are made of many cells and have specialized shapes that allow them to perform specific functions
C.) Multicellular organisms are made of one cell and have simple shapes that allow them to perform multiple functions
D.) Multicellular cells do not come from pre-existing cells.
Answers
Answer:
B.) Multicellular organisms are made of many cells and have specialized shapes that allow them to perform specific functions
Explanation:
Multicellular means that there is more than one cell.
Hope this helps!
what volume of a 1.3M solution can be made using 0.75 mole of CuCO3?
Answers
According to molar concentration, 0.576 liters of a 1.3 M solution can be made using 0.75 mole of CuCO₃.
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Substitution gives, volume= 0.75/1.3= 0.576 liters.
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In a _______ wave the matter in the medium moves back and forth at right angles to the direction
that the wave travels.
Answers
Transverse.
Longitudinal travels in the same direction as medium.
SnBr2
what is the name of this formula?
Answers
Tin bromide
Explanation:
Tin(II) bromide is a chemical compound of tin and bromine
Help please!! I'll name you brainliest!!
Answers
the answers is cacih2
wjdgagqjdhdgahahdhvddvvsvshsd
What is true of a gas
Answers
Answer:
did you have options, cause if you did chose something alond the lines of
Explanation:
A real gas is a gas that does not behave as an ideal gas due to interactions between gas molecules. A real gas is also known as a nonideal gas because the behavior of a real gas in only approximated by the ideal gas law.
What is another name for inner transition metals?
Answers
Inner transition metals are also known as lanthanides and actinides.
The lanthanides are the 14 elements with atomic numbers 58 through 71, while the actinides are the 14 elements with atomic numbers 90 through 103. These elements are called inner transition metals because they occupy the two rows at the bottom of the periodic table and have electrons in their f orbitals.
Lanthanides elements are highly reactive and have similar chemical and physical properties. They are used in a variety of applications, including lighting, magnets, and catalytic converters.
Actinides elements are radioactive and can undergo nuclear reactions, making them useful in nuclear power, nuclear medicine, and nuclear weapons.
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an herbicide contains only c , h , cl , and n . the complete combustion of a 150.0 mg sample of the herbicide in excess oxygen produced 156.9 ml of co2 and 91.52 ml of h2o vapor at stp. a separate analysis determined the 150.0 mg sample contained 41.36 mg cl . determine the percent composition of the herbicide.
Answers
The percent composition of the herbicide is 44.5% C, 6.27% H, 22.9% Cl, and 26.4% N.
To solve this problem, we will use the information provided to calculate the percent composition of the herbicide.
First, let's calculate the number of moles of CO2 and H2O produced by the combustion of the herbicide. We can use the ideal gas law to do this:
n_CO2 = (156.9 mL) / (22.4 L/mol) * (1 mol CO2 / 1 L) = 7.00 mol CO2
n_H2O = (91.52 mL) / (22.4 L/mol) * (1 mol H2O / 1 L) = 4.08 mol H2O
Next, let's calculate the number of moles of carbon, hydrogen, and nitrogen in the herbicide using the combustion reaction:
C_xH_yCl_zN_w + (x + y/4 - z/2) O2 → x CO2 + (y/2) H2O + z HCl + w NO2
From the balanced equation, we can see that the number of moles of CO2 produced is equal to the number of moles of carbon in the herbicide, and the number of moles of H2O produced is equal to the number of moles of hydrogen in the herbicide.
We can use this information to solve for the number of moles of carbon, hydrogen, and nitrogen in the herbicide:
n_C = 7.00 mol CO2
n_H = 8.16 mol H2O
n_Cl = 41.36 mg / 35.45 g/mol / 0.1500 g = 0.767 mol Cl
Since the herbicide contains no other elements besides C, H, Cl, and N, we can assume that the mass of the herbicide is equal to the sum of the masses of these elements. We can use this information to solve for the mass of the herbicide:
m_Herbicide = m_C + m_H + m_Cl + m_N
m_Herbicide = n_C * 12.01 g/mol + n_H * 1.008 g/mol + n_Cl * 35.45 g/mol + n_N * 14.01 g/mol
We can rearrange this equation to solve for the percent composition of the herbicide:
% C = (n_C * 12.01 g/mol / m_Herbicide) * 100% = 44.5%
% H = (n_H * 1.008 g/mol / m_Herbicide) * 100% = 6.27%
% Cl = (n_Cl * 35.45 g/mol / m_Herbicide) * 100% = 22.9%
% N = ((m_Herbicide - n_C * 12.01 g/mol - n_H * 1.008 g/mol - n_Cl * 35.45 g/mol) / m_Herbicide) * 100% = 26.4%
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You forgot to dry the bread knife when you washed it and reddish brown spots appeared on it. is it chemistry or physical change?
Answers
Answer:
Chemical because water + metal = rust.
Explanation:
A new substance was formed.
The GLUT-1 transporter has a K
m
for D-glucose of 1.5mM. The normal, resting plasma glucose concentration is about 90%w/v. The molecular weight of glucose is 180 g/mol. From this information, calculate a. the ratio between Qtrans and Qmax for GLUT-1. Assume saturation kinetics. What would happen if we had L-Glucose instead? Would Qtrans/Qmax be higher or lower? Explain briefly
Answers
The ratio between Qtrans and Qmax for GLUT-1 is 0.76.The ratio between Qtrans and Qmax for GLUT-1 when L-glucose is present would be lower than the ratio obtained in a. This is due to the fact that L-glucose is not a substrate for GLUT-1 transporters.
Given that Km=1.5mM,
[glucose]=90g/L
=90,000 mg/L/180g/mol
=500mM, and
v=Vmax[S]/(Km+[S])
Qmax=Vmax/Kmax
=Vmax/[S]
=Vmax/1.5mM, and
Qtrans=Vmax[glucose]/(Km+[glucose]).
Qmax is a limiting value for the glucose concentration at which transport rate is at its maximum. Given the following formula for transport. Qtrans/Qmax is lower than the ratio obtained. This is due to the fact that L-glucose is not a substrate for GLUT-1 transporters.
The ratio of Qtrans to Qmax can be found as follows When L-glucose is present, Qtrans/Qmax is lower than the ratio obtained. This is due to the fact that L-glucose is not a substrate for GLUT-1 transporters. When L-glucose is present, the transporters are unable to transport it. As a result, the transport rate is lower than when D-glucose is present. As a result, the ratio between Qtrans and Qmax would be lower than the ratio obtained in a.
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The amount of space occupied by a substance is its.
Answers
Answer:
volume
Explanation:
Volume is the answer
Solid objects have mass and take up space. Since it is only common knowledge, there is no need for an experiment to demonstrate it. Anything with mass and space is considered to matter. A volume is a unit used to describe how much space a substance or thing takes up.
We are aware that gas will occupy any accessible space because it lacks a fixed volume or shape. Compare this to the behavior of a liquid, which, when its volume is less than that of the space it occupies, always has a distinct upper surface.
Every material takes up space. For instance, if we place a stone inside a glass that is entirely full of water, some water will spill out of the glass. This is due to the fact that the stone takes the place of the water in the glass.
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What is the net ionic equation when solutions of ammonium sulfide ((NH_4)_2S) and Iron(II) Chloride (FeCl_2) are mixed?
Answers
The net ionic equation for the reaction between ammonium sulfide and iron(II) chloride is Fe²⁺ + S²⁻ → FeS.
To determine the net ionic equation when solutions of ammonium sulfide ((NH₄)₂S) and iron(II) chloride (FeCl₂) are mixed, we first need to write the balanced molecular equation and then determine the ions that participate in the reaction.
The balanced molecular equation for the reaction between ammonium sulfide and iron(II) chloride can be written as:
(NH₄)₂S + FeCl₂ → (NH₄)Cl + FeS
The net ionic equation represents the overall chemical reaction by showing only the species that are directly involved in the reaction, excluding spectator ions that do not participate in the chemical changes.
To determine the net ionic equation, we need to identify the ions that undergo a change during the reaction. In this case, the ammonium ion (NH₄⁺) and chloride ion (Cl⁻) are spectator ions and do not undergo any changes. Therefore, the net ionic equation can be written by excluding the spectator ions:
Fe²⁺ + S²⁻ → FeS
The net ionic equation for the reaction between ammonium sulfide and iron(II) chloride is Fe²⁺ + S²⁻ → FeS.
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help help help help help
Answers
Answer:
It's C.
Explanation:
According to the site, "http://needtoknow.nas.edu/energy/energy-sources/renewable-sources/wind/" ... "Wind energy is an indirect form of solar energy created by a combination of factors, including the uneven heating of Earth’s atmosphere by solar radiation, variations in topography, and the rotation of Earth. People have been putting wind energy to use throughout history to propel sail boats, mill flour from grain, and pump water."
this question is giving me a hard time
Answers
Answer:
options 3rd is the correct answer
Titanium(IV) selenide formula
Answers
Answer:
TiSe2
iExplanation:
the iV gives you the charge of the cation (titanium) abd you want enough se to balance out the charge to 0
the more massive an object is, the more
Answers
Answer:
it have more more mass, gravitational potential energy
Explanation:
Which part of Earth most likely has the highest albedo value?
Answers
Answer:
Sea ice
Explanation:
Sea ice has a much higher albedo compared to other Earth surfaces
Calculate 8D of water vapor in isotopic equilib- rium with fresh water whose 8D value is -65%0, assuming that a (liquid-vapor) = 1.090.
Answers
The value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.
The expression for calculating 8D of water vapor in isotopic equilibrium with fresh water can be given by: 8D = α 8D (vapor) + (1 - α) 8D (liquid). Where,α is a fractionation factor and 8D (vapor) and 8D (liquid) are the deuterium enrichments in water vapor and liquid, respectively.
The value of α is given by:a (liquid-vapor) = 1.090So,α = (a (liquid-vapor) - 1) / (a (liquid-vapor) + 1)α = (1.090 - 1) / (1.090 + 1)α = 0.045So,8D = α 8D (vapor) + (1 - α) 8D (liquid)Given,8D (liquid) = -65‰ (‰ denotes permil, which is equal to parts per thousand)
Substitute the given values in the expression and simplify:8D = 0.045 × 8D (vapor) + (1 - 0.045) × (-65)8D = 0.045 × 8D (vapor) - 61.9258D + 2.79125 = 8D (vapor)
Therefore,8D (vapor) = 8D - 2.79125= -65 - 2.79125= -67.79125‰ (answer)Therefore, the value of 8D of water vapor in isotopic equilibrium with fresh water whose 8D value is -65%0 is -67.79125‰.
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state the factors that affects the rate of chemical reaction
Answers
Which reaction represents the process of neutralization?
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)
Pb(NO3)2(aq) +CaCl₂(aq) → Ca(NO3)2(aq)+ PbCl₂(s)
2KCIO3(s)→2KCI(s) + 30₂(g)
Answers
Answer:
Explanation:
The correct reaction that represents the process of neutralization is:
HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)
Neutralization is a chemical reaction between an acid and a base, which results in the formation of water and a salt. In this case, hydrochloric acid (HCl) is the acid, and potassium hydroxide (KOH) is the base. When they react, they form potassium chloride (KCl) and water (H₂O).
how to create a particle model that would be more dense than a depicted one?
Answers
Answer:
make the particles close together (eg a solid is more dense than liquids as it has a fixed shape)