Answers
To determine the validity of the given statements, we need to calculate the enthalpy change of the reaction using the given enthalpies of formation.
The balanced equation for the reaction is:
2KCl(s) + 3O2(g) → 2KClO3(s)
The enthalpy change of the reaction (ΔHrxn) can be calculated using the following formula:
ΔHrxn = ΣnΔHf(products) - ΣnΔHf(reactants)
where ΣnΔHf represents the sum of the enthalpies of formation of the products and reactants, respectively.
Substituting the given enthalpies of formation, we get:
ΔHrxn = [2ΔHf(KClO3) - 2ΔHf(KCl) - 3ΔHf(O2)]
ΔHrxn = [2(-391.4 kJ/mol) - 2(-436.9 kJ/mol) - 3(0 kJ/mol)]
ΔHrxn = -791.6 kJ/mol
Therefore, the statements that are true for the reaction are:
AHrxn is -827.3kJ (false, the calculated value is -791.6 kJ/mol)
The reaction is exothermic, -AH (true, as the enthalpy change is negative)
Heat is a reactant (false, heat is not shown as a reactant in the balanced equation).
To know more about exothermic reaction, visit:
https://brainly.com/question/31214950
#SPJ1
The statements that are true for the reaction are:
Δ\(H_{rxn}\) is -827.3kJ (false, the calculated value is -791.6 kJ/mol)
The reaction is exothermic, -ΔH (true, as the enthalpy change is negative) ; Heat is a reactant (false, heat is not shown as a reactant in the balanced equation).
To determine the validity of the given statements, we need to calculate the enthalpy change of the reaction using the given enthalpies of formation.
The balanced equation for the reaction is:
\(2KCl(s) + 3O_2(g)\) → \(2KClO_3(s)\)
The enthalpy change of the reaction (Δ\(H_{rxn}\)) can be calculated using the following formula:
Δ\(H_{rxn}\) = ΣnΔ\(H_f\)(products) - ΣnΔ\(H_f\)(reactants)
where ΣnΔ\(H_f\) represents the sum of the enthalpies of formation of the products and reactants, respectively.
Substituting the given enthalpies of formation, we get:
Δ\(H_{rxn}\) = [2Δ\(H_{f(KClO3)}\) - 2Δ\(H_{f(KCl)}\) - 3Δ\(H_{f(O2)}\)]
Δ\(H_{rxn}\) = [2(-391.4 kJ/mol) - 2(-436.9 kJ/mol) - 3(0 kJ/mol)]
Δ\(H_{rxn}\) = -791.6 kJ/mol
For more question on exothermic click on
https://brainly.com/question/11875946
#SPJ1
Related Questions
A rock is an
of minerals.
The
of a rock is a result of its mineral composition.
Most rocks contain more than one type of
.
Answers
Answer:
mineral
Explanation:
Answer:
1. Aggregate
2). Color
3). Mineral
Explanation:
1. A rock is an aggregate of minerals
2. The color of a rock is a result of its minerals composition
3 most rocks contain more than one type of minerals
What it the pI of glycine? The structure and pKa values are shown below. A) 5.97 B) 7.50 C) 7.26 D) 3.63 E) 11.94 What is the pI of arginine? The structure and pKa values are shown below. A) 10.76 B) 7.90 C) 9.67 D) 7.33 E) 5.61 Given the product for the following reaction. a) Alanine B) leucine C) valine D) isoleucine E) glycine Which labeled bond in the following molecule is known as the peptide bond? A) 1 B) 2 C) 3 D) 4 E) 5
Answers
Answer:
The pI of glycine is 5.97, the pI of arginine is 10.76, and the labeled bond in the given molecule that is known as the peptide bond is bond 3. The product of the given reaction cannot be determined without additional information.
Explanation:
I NEED HELP ASAP what is the difference between an isotopes mass number and an elements atomic mass number?
Answers
Answer: the atomic is at the top the the element
Explanation: when you have an element like carbon you have the atomic number witch is on top then you have the atomic mass witch is the decimal and the bottom it could be a whole number or a decmial
Draw the conjugate acid for the following base (lone pairs do not have to be drawn):
Answers
move double bond add line pairs to Oxygen and make negative then move a double bond into the hexagon
If you know that E = h ƒ where h = 6.63 x 10⁻³⁴ J•s and c = (wavelength)(frequency) where c = 3.00 x 10⁸ m/s then calculate the amount of energy in a green light with a wavelength of 510 nm. (1 nm = 1 x10⁻⁹ m) Please show work.
Answers
For this question, we are going to use two formulas to find the energy, the first one is already described in the question itself, which is:
E = h*f
Where:
E = energy
h = planck's constant, 6.63*10^-34
f = frequency, which we have to find
And the next formula will be:
f = c/λ
Where:
f = frequency
c = speed of light, 3.00*10^8 m/s
λ = wavelenght, 510 nm
Now let's solve the frequency formula first:
f = 3.00*10^8/510*10^-9
f = 5.88*10^14
Now we use this value of frequency to find the energy
E = 6.63*10^-34 * 5.88*10^14
E = 3.9*10^-19 J
What do we need in order to obtain energy?
Answers
Explanation:
hope it helps thanks ❤
brainliest please
Answer:
Explanation:
human obtains energy by eating food. as food is digested n broken down in our digestive system, energy is released to our body.
A chemist experiments on a molecule with the formula of c5h10o5. this compound is likely a(n) ________.
Answers
A chemist experiments on a molecule with the formula of c5h10o5. this compound is likely a(n) carbohydrates.
A molecule with the formula C₅H₁₀O₅ is carbohydrates.
What are Carbohydrates?
The carbohydrates are represented through the chemical system Cₙ(H₂O)ₓ.C denotes carbon within the components with a few water molecules. hence, carbohydrates mean hydrated carbon as it has some water molecules attached.The ratio of carbon, hydrogen and oxygen in carbohydrates is 1:2:1.Glucose is the maximum plentiful and simple carbohydrate.Monosaccharides and polysaccharides are the 2 kinds of carbohydrates.Carbohydrates are biomolecules.they also offer electricity to living things through numerous meals like bread, and rice, and so forth.therefore the molecular method C₅H₁₀O₅ represents carbohydrates.
To learn more about Carbohydrates, visit: https://brainly.com/question/14614055
#SPJ4
What is the limiting reagent in this experiment, sodium bromide or 1-butanol?
Answers
the balanced equation of the reaction :NaBr + C4H9OH → C4H9Br + Na OH Sodium Bromide (NaBr) is the limiting reagent in the experiment, not 1-butanol.
The limiting reagent in the experiment between sodium bromide and 1-butanol is sodium bromide.What is a limiting reagent ?A limiting reagent is a reactant in a chemical reaction that restricts the yield of the product. It means the reaction can't go on forever because the reagents are consumed up. In general, the limiting reagent determines the amount of products that can be produced during a reaction .In the given chemical reaction between sodium bromide and 1-butanol, it is essential to know which reactant is the limiting reagent. the balanced equation of the reaction :NaBr + C4H9OH → C4H9Br + Na OH Sodium Bromide (NaBr) is the limiting reagent in the experiment, not 1-butanol.To identify the limiting reagent, you need to know the balanced chemical equation, the amounts or concentrations of the reactants, and their stoichiometric ratios. With that information, we can compare the actual amounts of each reactant to their stoichiometric ratios to determine which one will be completely consumed and thereby limit the reaction.
to know more about stoichiometric, visit
https://brainly.com/question/14935523
#SPJ11
Copper(ii) chloride reacts with sodium nitrate to produce copper(ii) nitrate and sodium chloride.
Answers
Answer:
CuCl2 + 2NaNO3 - > Cu(NO3)2 + 2NaCl
moon are near
5.
pulls all objects in the universe, including the
moon and Earth and the sun and Earth, toward each other.
Answers
Answer:
gravity
Explanation:
Gravity holds the universe together and is a force exerted by any object with mass.
Do you think that the band of light rock i younger,older,or the ame age a the rock that that urround it?
Answers
The band of light rock is younger.
What rock has bands of light and dark minerals?
Granite is a type of rock that has bands of light and dark minerals. It is composed of two main minerals, quartz and feldspar, and can contain smaller amounts of othGranite is a common type of intrusive, felsic, igneous rock that is granular and phaneritic in texture. Granite is a common type of intrusive, felsic, igneous rock that is granular and phaneritic in texture. It is a very hard, durable rock that is resistant to erosion and weathering, making it a popular choice for construction and building materials. Granite is also popular for use in countertops, flooring, and other decorative applications.
The band of light rock is usually younger than the rock that surrounds it. This is because light rock is typically formed through a process of erosion, which requires time for the rock to wear away. On the other hand, the rock that surrounds the light rock is typically much older, often having been formed millions of years ago.
Hence, the band of light rock is usually younger.
To learn more about band of light rock from the link
https://brainly.com/question/14098376
#SPJ4
what is the formula for calculating kinetic energy
Answers
Answer:
K.E. = 1/2 m v2
Explanation:
kinetic energy = half mass × volume²
1 Select the correct answer! Which statement best explains the octet rule? A. Atoms gain, lose, or share electrons to achieve a full valence shell. D B. Compounds always consist of eight electrons. oa. |||||Molecules always consist of eight atoms. OD. All atoms require eight electrons to form bonds. Reset Next Entum. All rights reserved.
Answers
Answer:
A. Atoms gain, lose, or share electrons to achieve a full valence shell
Explanation:
The octet rule is best explained as the process in which atoms lose or gain or share electrons to achieve a full valence shell.
In this process bonds are formed when there is an attraction between the two substances. For electrovalent compounds, an atom will lose electrons or gain electron to form an ion, the electrostatic attraction causes the bond formation. Covalent compounds, form by sharing of electrons.Therefore, the octet rule is attained when atoms gain full valence configuration.
Calculate the number of grams in 1.50 molecules of calcium chloride
Answers
R. F. My (Relative Formula Mass ) of CaCl2 =40+(2*35.5)
=111
6.02*10^23=111
1.5=(111*1.5)/6.02*10^23
=2.766*10^24
if you ballcne the combines electrons so tht 314 moles of nh4 are oxidized to no2. how many moles of h will be produced
Answers
The 628 moles of H will be produced.
The balanced chemical equation for the oxidation of NH4 to NO2 is given by: NH4 + 2O2 → NO2 + 2H2OWe are told that 314 moles of NH4 are oxidized to NO2. From the balanced equation, we can see that 1 mole of NH4 produces 2 moles of H2O.
Therefore, 314 moles of NH4 would produce:314 moles NH4 x (2 moles H2O/1 mole NH4) = 628 moles H2OHowever, we are interested in the number of moles of H produced. From the balanced equation, we can see that 1 mole of NH4 produces 2 moles of H. Therefore, 314 moles of NH4 would produce:314 moles NH4 x (2 moles H/1 mole NH4) = 628 moles H
To know more about produced:
https://brainly.com/question/30698459
#SPJ11
An ionic compound formed by a neutralization reaction
a.
acid
c.
solvent
b.
base
d.
salt
Answers
Answer: salt
Explanation:
..................
Identify each pair of elements as likely to participate in ionic bonding when bonded together. Use your periodic table.
1. Sodium & Chlorin (NaCI) :
2. Carbon & Oxygen (CO2):
3. Hydrogen & oxygen (H2o)
4. Iron & oxygen (Fe2o3):
5. Magnesium & Sulfur (MgS):
Answers
Answer:
1) NaCl, 5)MgS
Explanation:
What makes something an Ionic Bond:
Ionic bonds are generally between two oppositely charged ions. Usually salts are formed. A metal and nonmetal are also generally considered to be ionic. Electronegativity also plays a role in a difference of electronegativity of elements being greater than 2.0.For 1) Na has a charge of 1+ and Cl has a charge of 1-. They both come together to form table salt. Their electronegativity is also larger than 2.0. Also Na is a metal and Cl ion is a nonmetal.
For 2) C and O are both nonmetals and are covalent bonds
For 3) Water is a polar covalent molecule because there is a electronegativity difference between H and O, but not great. H and O are also nonmetals.
For 4) While Fe is a metal and O is a nonmetal, their electronegativity difference is not greater than 2.0. This makes it polar covalent.
For 5) Mg is a metal and S is a nonmetal. They have a large electronegativity difference. Also Mg has a charge of 2+ while S has a charge of 2-.
what is the mass of 1.25 mol of zinc
Answers
Answer:
1 mole is equal to 1 moles Zinc, or 65.38 grams.
Explanation:
Could i have branliest, heart and 5 stars thanks!
Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions?
1.A different mixture is formed in each case.
2.A different solution is formed in each case.
3.Both a change of state and of elements is involved.
4.New molecules are formed but the same elements exist.
Answers
Answer:
3
Explanation:
beacuses im right
An element reacts with oxygen to give a compound with a high melting point. This compound is also
soluble in water. Name the element.
Answers
Answer:
Thus, we can say that the element is calcium. This can be clearly understood as ionic compounds have high melting and boiling points in general such as calcium oxide.
Answer:
The element is Calcium I guess.
Explanation:
Cause calcium oxide has high melting point and is soluble in water.
Is the name for a vertical column in the periodic table
Answers
Which chemical equation is correctly balanced?
O Mg(NO3)2 + 2K2CO3 →→ MgCO3 + 2KNO3
O Mg(NO3)2 + K2CO3 → MgCO3 + 2 KNO3
2Mg(NO3)2 + K2CO3 - 2MgCO3 + KNO3
Mg(NO3)2 + K2CO3
MgCO3 + KNO3
Answers
Answer:
Mg (NO3)2+ K2CO3 ⇒ Mg CO3 + KNO3
Mg=1 ,N =2, O =6 +3 9 ,K =2 ,C=1 , (reactant side)
Mg =1, C = 1 ,O = 3+3 = 6 , K= 1., N =1 (product side)
Mg(NO3)2 + K2CO3 ⇒ Mg CO3 + 2KNO3
Mg =1 , C = 1, O =3+6=9, K = 2 IN product side
ANS:
Mg (NO3)2 +K2CO3 ⇒ MgCO3 +2 KNO3
Explanation:
Which of the following is the correct equation for the reaction below?
One molecule of propane gas reacts with five molecules of oxygen gas to form three molecules of carbon dioxide gas and four molecules of water vapor.
A. CzHg (g) + 502 (9) ► 3C02 (9) + 4H20 (9)
B. C3Hg (s) + 502 (s) — 3CO2 (s) + 4H20 (3)
C. CH (9) + 502 (9) — 3C02 (9) + 4HO (9) D. CzHg (9) + 50 (g) → 3C0 (g) + 4H20 (9)
need asap
Answers
Answer:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Explanation:
One molecule of propane gas reacts with five molecules of oxygen gas to form three molecules of carbon dioxide gas and four molecules of water vapor.
To every chemical equation, there are products and reactants:
Reactants → Products
Here:
Reactants:
1 mole of propane = C₃H₈
5 mole of oxygen gas = 5O₂
Products;
3 mole of CO₂ = 3CO₂
4 moles of water vapor = 4H₂O
The reaction equation is therefore;
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Answer:
C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g)
Explanation:
This is the actual answer
what evidence have you discovered to explain how the structure of compounds determens the properties of the compounds
Answers
All of the properties such as ice floating on water, while most solids would sink when placed in its liquid are all due to the structure of the compounds.
The structure of the compounds includes the bonding angle, the type of bonds, the size of the molecule, the interactions between the molecules etc. Slight changes in the chemical structure and affect the properties if the compound.
Isomeric compounds with the same chemical formula but different structures can have different melting and boiling point and differ in reactivity and flammability.
Another common change in isomers are with the double bonds. A double bond can be in the cis formation or in the trans formation, and this will affect its properties as trans isomers will be having high melting point than the cis isomer.
Thus, structure of compounds do determine the properties of the compounds.
To know more about the structure and properties of compounds
https://brainly.com/question/4661963
#SPJ1
C6H12O6 O3 NF3 Co KNO3 H2 CO
Which one of these are molecules list all that apply
Answers
(d) If 48.0 g of NaCl react with 19.0 g of H₂SO4, what mass of Na2SO4 will be produced?
Answers
Answer:
the mass of Na2SO4 produced is 27.6 g.
Explanation:
determine the balanced chemical equation for the reaction between NaCl and H₂SO4, and then use stoichiometry to calculate the mass of Na2SO4 produced.
The balanced chemical equation for the reaction is:
2 NaCl + H₂SO4 → Na2SO4 + 2 HCl
This equation tells us that 2 moles of NaCl react with 1 mole of H₂SO4 to produce 1 mole of Na2SO4.
First, we need to determine the number of moles of NaCl and H₂SO4 we have:
moles of NaCl = mass / molar mass = 48.0 g / 58.44 g/mol = 0.821 mol
moles of H₂SO4 = mass / molar mass = 19.0 g / 98.08 g/mol = 0.194 mol
Since H₂SO4 is the limiting reactant (it is present in less amount than required for complete reaction), we need to use the number of moles of H₂SO4 to calculate the number of moles of Na2SO4 produced:
moles of Na2SO4 = moles of H₂SO4 / 1 x (1 mole Na2SO4 / 1 mole H₂SO4) = 0.194 mol x (1/1) = 0.194 mol
Finally, we can use the molar mass of Na2SO4 to calculate the mass of Na2SO4 produced:
mass of Na2SO4 = moles of Na2SO4 x molar mass = 0.194 mol x 142.04 g/mol = 27.6 g
Therefore, the mass of Na2SO4 produced is 27.6 g.
c What mass of gas is present in
48 cm of oxygen. O2
Answers
Answer:
carbon dioxide
Explanation:
because we breath in oxygen and breath out Carbon
mL? PLEASEEE HELP
What is the answer
Answers
The phase change from a solid to a liquid is __________
Answers
Answer:
Melting
Explanation:
The phase change from a solid to a liquid is called melting, also known as fusion. During this phase change, the substance absorbs heat energy, which causes the particles in the solid to vibrate more and overcome the attractive forces holding them in a fixed position. As a result, the particles gain enough energy to break their bonds and move freely, causing the solid to become a liquid. The temperature at which this phase change occurs is known as the melting point, and it varies depending on the substance.
Write the steps for an IONIC BOND for KCI.
Answers
Answer:
Potassium chloride, KCl , is an ionic compound formed by the electrostatic force of attraction that holds the potassium cations and the chlorine anions together. Potassium, K , is located in group 1 of the Periodic Table.
Explanation:
thanks