The standard reaction enthalpy and the standard reaction enthalpy at 400 K for this reaction are equal to 0.35 kJ and 0.000125 kJ respectively.
How to calculate Gibbs's free energy?Mathematically, the Gibbs's free energy for this chemical reaction can be calculated by using this formula:
ΔG° = -RTlnK = ΔH° - TΔS° ......equation 1.
First of all, we would determine the value of lnK from the given expression at 390 K and 410 K respectively:
lnK = A + B/T + C/T²
lnK = -1.04 - 1088/T + 1.51 × 10⁵/T²
lnK = -1.04 - 1088/390 + 1.51 × 10⁵/390²
lnK = -1.04 - 2.79 + 0.99
lnK = -2.84.
At T = 410 K, we have:
lnK' = -1.04 - 1088/410 + 1.51 × 10⁵/410²
lnK' = -1.04 - 2.65 + 0.90
lnK' = -2.79.
For the standard reaction enthalpy, we have:
lnK' - lnK = ΔH°/R(1/T - 1/T')
-2.79 - (-2.84) = ΔH°/8.314(1/390 - 1/410)
-2.79 + 2.84 = ΔH°/8.314(0.00256 - 0.00244)
0.05 = ΔH°/8.314(0.0012)
0.4157 = 0.0012ΔH°
ΔH° = 0.4157/0.0012
ΔH° = 346.42 ≈ 0.35 kJ.
Next, we would determine the Gibbs's free energy at each temperature:
At T = 390 K, we have:
ΔG° = -RTlnK
Δ₁G° = -8.314 × 390 × (-2.84)
Δ₁G° = 9.21 kJ/mol.
At T = 410 K, we have:
Δ₂G° = -8.314 × 410 × 2.79
Δ₂G° = 9.51 kJ/mol.
For the standard reaction enthalpy at 400 K, we have:
ΔG° = ΔH° - TΔS°
9.51 - 9.21 = 0.35 - 400ΔS°
0.30 = 0.35 - 400ΔS°
400ΔS° = 0.35 - 0.30
400ΔS° = 0.05
ΔS° = 0.05/400
ΔS° = 0.000125 kJ.
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Predict the nature of the indicated
covalent bond.
non-polar
Explanation :
Hydrogen and carbon have similar electronegativity values, so the C—H bond is not normally considered a polar covalent bond.
nts
S + 6 HNO3 → H₂SO4 + 6 NO₂ + 2 H₂O
In the above equation, how many grams of water can be made when 19.7 moles of HNO3 are
consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report
the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark
your answer incorrect.:
Molar
Mass
Element
Hydrogen 1
Nitrogen 14
Sulfur 32
Oxygen 16
Answer:
118.2 g H₂O
Explanation:
To find the mass of water, you need to (1) convert moles HNO₃ to moles H₂O (via mole-to-mole ratio from reaction coefficients) and then (2) convert moles H₂O to grams H₂O (via molar mass).
The molar mass of water can be found by combining the element's molar masses times their quantities. The ratios/conversions should be arranged in a way that allows for the cancellation of units (desired unit should be in the numerator).
Molar Mass (H₂O): 2(1 g/mol) + 16 g/mol
Molar Mass (H₂O): 18 g/mol
S + 6 HNO₃ ---> H₂SO₄ + 6 NO₂ + 2 H₂O
^ ^
19.7 moles HNO₃ 2 moles H₂O 18 g
-------------------------- x ----------------------- x --------------------- = 118.2 g H₂O
6 moles HNO₃ 1 mole H₂O
What is the SI unit used to measure weight?
Answer:
The si unit used to measure weight is kilogram /kg
- How many grams are in 1.4 x 10¹5 atoms of calcium?
Answer:
40 g= 6.022×10²³
x=1.4×10¹⁵
x=40g×6.022×10²³/1.4×10¹⁵
x=17.77×10⁸
Please help
Logan has been studying rocks at school. How could he learn more about the different types of rocks that come from volcanoes?
A.
collect rocks at the shore
B.
read comics about imaginary rocks
C.
explain to his sister how volcanoes form
D.
watch videos about volcanic rocks
Answer:
I think D is the answer. The others can't be answer. Specially B and D can't be the answer.
Question 3
What part of a water molecule is the negatively charged side?
Answer:
The oxygen atom in water has a negative charge.
Definitions:Polar molecule: A molecule in which the centroid of the positive charges is different from the centroid of the negative charges.
Oxygen: A colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular weights until 1961, when carbon 12 became the new standard. Symbol: O; atomic weight: 15.9994; atomic number: 8; density: 1.4290 g/l at 0°C and 760mm pressure.
Water: A transparent, odorless, tasteless liquid, a compound of hydrogen and oxygen, H2O, freezing at 32°F or 0°C and boiling at 212°F or 100°C. that in more or less impure state constitutes rain, oceans, lakes, rivers, etc.: it contains 11.188 percent hydrogen and 88.812 percent oxygen, by weight.
Hydrogen: A colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known element. Symbol: H; atomic weight: 1.00797; atomic number: 1; density: 0.0899 g/l at 0°C and 760 mm pressure.
Atom: Am atom is the smallest constituent particle of a chemical element which has the properties of that element. They re comprised of at least an electron and a portion, as is the case for Hydrogen. Atoms of all other elements however, contain at least one neutron.
Proton: A positively charged elementary particle that is a fundamental constituent of all atomic nuclei. It is the lightest and most stable baryon, having a charge equal in magnitude to that of the electron, a spin of 1/2, and a mass of 1.673 × 10-27kg. Symbol: P.
Electron: An elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10-19 coulombs, ha mass of 9.108 × 10-31 kilograms, and spin of 1/23, and existing independently or as the component outside the nucleus of an atom.
Neutron: An elementary particle having no charge, mass slightly greater than that of a proton, and spin of 1/2: a constituent of the nuclei of all atoms except those of hydrogen. Symbol: n.
What is a negative charge?A object has a negative charge when it consists of more electrons than protons.
With a partial positive charge on 2 Hs and a partial negative charge on oxygen, water molecules are polar molecules.
Actually, two hydrogen atoms and the core oxygen atom of water are covalently connected. Due to its greater electronegative nature than hydrogen, oxygen pulls the bound electron pair in the middle of the atom toward it.
When illustrating higher electron densities over oxygen, partial negative charge is used, whereas partial positive charge is used to illustrate lower densities over hydrogen atoms.
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B. Flourine is the right answer
Answer:
Whts ur question??
..?
Explanation:
Was this by mistake or smthin
You are working with a concentrated solution of ammonium hydroxide. Which
piece of safety equipment is most important to have on hand?
Rubber gloves and other chemical resistant protective clothing are necessary when handling concentrated ammonium hydroxide.
Why it is necessary to handle concentrated solution of ammonium hydroxide with care ?Ammonia is an irritant and corrosive to the skin, eyes, respiratory tract and mucous membranes. May cause severe chemical burns to the eyes, lungs and skin.The extent of injury produced by exposure to ammonia depends on the duration of the exposure, the concentration of the liquid or vapor and the depth of inhalation.
Hence, Rubber gloves and other chemical resistant protective clothing are necessary when handling concentrated ammonium hydroxide.
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The standard oxidation-reduction potential of a system Fe3+ —> Fe2+ is 0.77 V. What is the ratio of the oxidized form concentration to the reduced form concentration if E = 0.711 V?
Based on the oxidation-reduction potential of the system, ratio of the concentration of the oxidized form to the concentration of the reduced form is 1 : 10.
What is standard oxidation-reduction potential of a system?The oxidation-reduction potential of a system is a measure of the tendency for a given chemical species to be reduced.
The reduction equation is as follows:
[tex]Fe^{3+} \rightarrow Fe^{2+} = 0.77\:V[/tex]
Using the equation:
[tex]E = E^{o} - \frac{0.0592}{n}log\frac{[Fe^{2+}]}{[Fe^{3+}]}[/tex]
n = 1; E⁰ = 0.77; E = 0.711
Substituting the values and using 1/x as the ratio:
[tex]0.711 = 0.77 - \frac{0.0592}{1} * log\frac{1}{x}[/tex]
x = 1/10
Therefore, the ratio of the concentration of the oxidized form to the concentration of the reduced form is 1 : 10.
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Barium nitrate (Ba(NO3)2) reacts with sodium chloride (NaCl) in a double replacement (displacement) reaction, shown below.
Ba(NO3)2(aq)+NaCl(aq)-->???
How many grams of barium salt are produced when a solution containing 21.7 g of Barium nitrate is mixed with a solution containing excess sodium chloride?
Use 261.34 as the molar mass for barium nitrate. Round to three significant digits.
Answer:
you know that they will be a displacement reaction that will form a barium salt:
Ba(NO3)2+ 2NaCl--> BaCl2 + 2NaNO3
So now that we have that formula and the molecular weight we can determine how much salt will be made. So here we convert the grams to moles
(42.3g Ba(NO3)2)*(1 mole/261.34g) = 0.16185 mol
In the molecular formula we know that 1 mole of Barium nitrate will create 1 mole of Barium chloride, so in this case (in a perfect world) you should get 0.16185 mole of barium chloride (208.23 g/mol) that we then have to convert to grams.
(0.16185 mol BaCl2) * ( 208.23 g/mol) = 33.7037 g of Barium Chloride (rounded to 3 significant digits = 33.7g)
Which of the following statements about carbon dioxide is not true?
Increased carbon dioxide in the atmosphere increases the Greenhouse Effect.
Carbon dioxide is a greenhouse gas.
Atmospheric carbon dioxide levels have slowly declined over the last 50 years.
Burning fossil fuels can increase carbon dioxide levels in the atmosphere.
Hydrogen and iodine vapour exist in equilibrium with hydrogen iodide at a constant temperature in a gas syringe.
H2 + I2
2HI
Which of the following will increase when the pressure is increased at constant temperature? [Assume that the mixture shows ideal behavior.]
The pressure has no effect on the equilibrium constant.
What is Equilibrium ?Equilibrium is a state when the forward reaction rate is equal to the backward reaction rate .
The equation given is
H₂ + I₂ ⇄ 2HI
The Equilibrium constant depends only upon temperature and nature of reaction ,
It is independent of catalyst presence , initial concentration of reactants,and pressure.
The pressure has no effect on the equilibrium constant.
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In a container with 512.1 L water, the pH should be changed to 5 using 95% sulfuric acid. The question is how much sulfuric acid is needed.
Answer:
15
Explanation:
I got it right I just had the answer
The heat of vaporization of water is 540 cal/g. How much heat is needed to change 4.28g of water to steam?
Answer:
2311.2 cal
Explanation:
540 cal / g * 4.28 g = 2311.2 cal
2311.2 cal heat is needed to change 4.28g of water to steam.
What is heat?Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
The heat of vaporization is defined as the amount of heat needed to turn 1g of a liquid into a vapour, without a rise in the temperature of the liquid.
The heat of vaporization is equal to the thermal energy required for vaporization divided by the mass of the substance that is vaporizing. Its formula is Hv = q/m.
Putting the values in the formula:
540 cal / g x 4.28 g = 2311.2 cal
Hence, 2311.2 cal heat is needed to change 4.28g of water to steam.
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HELP! ASAP!
1. Using the model below, identify the products, reactants, and limiting reactant in the chemical reaction. Please provide an explanation of your reasoning. In addition, write the balanced chemical equation for the reaction that is taking place in the chamber.
Given the model from the question,
The products are: N₂, H₂O and H₂The reactants are: H₂ and NOThe limiting reactant is H₂The balanced equation is: 3H₂ + 2NO —> N₂ + 2H₂O + H₂Balanced equationFrom the model given, we obtained the ffolowing
Red => Oxygen Blue => Nitrogen White => HydrogenThus, we can write the balanced equation as follow:
3H₂ + 2NO —> N₂ + 2H₂O + H₂
From the balanced equation above,
Reactants: H₂ and NOProduct: N₂, H₂O and H₂How to determine the limiting reactant3H₂ + 2NO —> N₂ + 2H₂O + H₂
From the balanced equation above,
3 moles of H₂ reacted with 2 moles of NO.
Therefore,
5 moles of H₂ will react with = (5 × 2) / 3 = 3.33 moles of NO
From the calculation made above, we can see that only 3.33 moles of NO out of 4 moles given are required to react completely with 5 moles of H₂.
Thus, H₂ is the limiting reactant
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The concentration of lead nitrate Pb(NO3)2
in a 0.726 M solution is __________ molal. The
density of the solution is 1.202 g/mL.
Answer: The concentration of lead nitrate Pb(NO3)2 in a 0.726 M solution is 0.755 molal.
Explanation:
Given:
The molar mass of Pb(NO3)2 is 331.2 g/mol
Assuming 1 litre of solution. This would equal 1202 g of solution
In the one litre of solution, you have 0.726 mol Pb(NO3)2
0.726 mol (331.2 g/mol) = 240.5 g Pb(NO3)2
Mass of water in 1 L of solution = 1202 g - 240.5 g = 961.5 g = 0.9615 kg
Molality = mols of solute / kg of solvent
= 0.726 mol / 0.9615 kg
= 0.755 m Pb(NO3)2
A dose of 156 mg of acetaminophen is prescribed for a 13−kg child. If one teaspoon contains 5.0 mL, how many teaspoons of Children’s Tylenol (80. mg of acetaminophen per 2.5 mL) must be administered?
Answer:
Just under 1 tsp
Explanation:
This is a situation where dimensional analysis is helpful....
156 mg / (80 mg / 2.5 ml * 5 ml / tsp ) =
156 mg / ( 160 mg/tsp) = .975 tsp ~~~ 1 tsp
Which statement best explains why gneiss is composed of layers but there are no layers in granite?
Gneiss is a sedimentary rock and granite is a metamorphic rock.
Gneiss is a metamorphic rock and granite is a sedimentary rock.
Granite is formed due to the slow cooling of magma below Earth's surface and gneiss is formed due to metamorphosis.
Granite is formed due to the accumulation of sediments and gneiss is typically formed due to intense heat and pressure.
Gneiss is a sedimentary rock and granite is a metamorphic rock. That is option A.
What are rocks?Rocks are geological hard materials that are made up of various types which include:
Sedimentary rocks: These are rocks that made up of various layers formed from sediments. Example is the gnesis.Metamorphic rocks: These are rocks that are form from pre existing rocks that undergoes some transformation. Example is graniteTherefore, Gneiss is a sedimentary rock and granite is a metamorphic rock.
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Answer:
C
Granite is formed due to the slow cooling of magma below Earth's surface and gneiss is formed due to metamorphosis.
Explanation:
I took the test!
The absolute molar entropies of O2 and N2 are 205 J K-1 mol -1 and 192 J K-1 mol-1, respectively, at 25°C. What is the entropy of a mixture of 2.4 moles of 02 and 9.2 moles of N2 at the same temperature and pressure?
The entropy of a mixture is 96.44J K-1 mol -1
The absolute molar entropies of O2= 205 J K-1 mol -1 The absolute molar entropies of N2=192 J K-1 mol -1 Moles of O2 present(m)=2.4Moles of N2 present(n)=9.2The formula for calculating the entropy of a mixture-
Δ[tex]S_{mix} =[/tex][tex]-nR(X_{O2} ln_{XO2} +X_{N2} lnX_{N2})[/tex]
X=mole fraction
total no. of moles(t)=m + n
=2.4+9.2
=11.6 moles
now substituting the values-
entropy of mix=-11.6R(2.4/11.6 + 9.2/11.6)
=11.6R
( R=8.314 ) =11.6×8.314
=96.44J K-1 mol -1
hence, The entropy of a mixture is 96.44J K-1 mol -1
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What would most likely happen when a metal is heated?
It will melt.
It will solidify.
Its temperature will decrease.
Its particles will move slower.
Answer: it is A i took the test i got it right
Explanation: i took the test
reaction of cysteine and NaOH
Answer:
cysteine is HOOC-CH--CH₂-SH
reaction with Naoh
HOOC-CH--CH₂-SH + Naoh ---->oh-oNH2-oh + H2o
Convert the scientific notation to a decimal number.
To convert Scientific Notation to a decimal number, Prescribed steps are to be taken given below.
What is Scientific Notation ?Scientific notation is a way of writing very large or very small numbers.
A number is written in scientific notation when a number between 1 and 10 is multiplied by a power of 10.
Steps to Calculate Scientific Notation ;Determine the exponent, n , on the factor 10 .Move the decimal n places, adding zeros if needed. If the exponent is positive, move the decimal point n places to the right. If the exponent is negative, move the decimal point |n places to the left.Check.Learn more about Scientific Notation here ;
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Given the following list of densities, which materials would float in a molten vat of lead provided that they do not themselves melt? Densities: g/mL: lead= 11.4; glass= 2.6, gold= 19.3, charcoal= 0.57, platinum = 21.4. Enter your answer as a word only. If two or more items would float include the word and between those two items.
The materials that would float in a molten vat of lead are glass and charcoal.
Which material floats on the solution?Glass and charcoal are the materials that would float in a molten vat of lead because they are less denser than the lead solution while on the other hand, platinum and gold get drowned into the solution because of its high density as compared to lead.
So we can conclude that the materials that would float in a molten vat of lead are glass and charcoal.
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Aqueous Copper (II) nitrate reacts with aqueous potassium iodide to form Copper (II) iodide solid and potassium nitrate
Answer:
Cu(NO₃)₂ (aq) + 2 KI (aq) ---> CuI₂ (s) + 2 KNO₃
Explanation:
When writing the reaction with the symbols, you need to take into account the charges of the ions. If he charges on the ions do not balance out in a molecule, they need to be made up for in the form of subscripts. For example, copper (+2) and iodine (-1) have charges which do not balance. Thus, to make the molecule neutral, you need to have two iodine atoms (CuI₂).
The unbalanced equation:
Cu(NO₃)₂ (aq) + KI (aq) ---> CuI₂ (s) + KNO₃
Reactants: 1 copper, 2 nitrate, 1 potassium, 1 iodine
Products: 1 copper, 1 nitrate, 1 potassium, 2 iodine
The balanced equation:
1 Cu(NO₃)₂ (aq) + 2 KI (aq) ---> 1 CuI₂ (s) + 2 KNO₃
Reactants: 1 copper, 2 nitrate, 2 potassium, 2 iodine
Products: 1 copper, 2 nitrate, 2 potassium, 2 iodine
Which element has properties most like Mg?
Answer:
The elements which are in the group
what's the name of the compound?
A student combined equal amounts of two solutions. One solution had a pH of 2 and the other had a pH of 12. Which would
most likely be the resulting pH?
1
3
6
11
Answer:
the answer is 6. 2 goes into 12 6 times resulting in the answer 6
When 50.5 g iron(III) oxide reacts with carbon monoxide, 32.2 g iron is produced. What is the percent yield of the reaction?
Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)
93.80 % is the per cent yield of the reaction [tex]Fe_2O_3(s)+3CO(g)[/tex] → [tex]2Fe(s)+3CO_2(g)[/tex].
What is a mole?A mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs.
[tex]Fe_2O_3(s)+3CO(g)[/tex] → [tex]2Fe(s)+3CO_2(g)[/tex]
[tex]50.5 g Fe_2O_3[/tex] x ([tex]1 mol of Fe_2O_3[/tex] ÷ [tex]159.69 g Fe_2O_3[/tex]) x ([tex]2 mol\; of Fe[/tex] ÷ [tex]1 mol Fe 34.97 g Fe[/tex])
[tex]% of yield = \frac{Practical X 100}{Theoretical}[/tex][tex]Percentage \;of \;yield = \frac{Practical X 100}{Theoretical}[/tex]
[tex]Percentage\; of yield = \frac{32.8 X 100}{34.97}[/tex]
= 93.80 %
Hence, 93.80 % is the per cent yield of the reaction.
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Given the following equation, how many grams of PbCO3 will dissolve when 2.50 L of 1.50 M H+ is added to 3.00 g of PbCO3?
Given
PbCO3(s) + 2H+(aq) = Pb^2(aq)+ +H2O (l)+ CO2(g)
What’s the gravitational potential energy of a book 2.0 meters above the floor with a mass of 1.5 kilograms
Answer:
29.3 joules
Explanation:
P.E. = mgh
= 1.5 kg * 9.81 m/s^2 * 2 m = 29.3 Joules
