1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
almond37 [142]
3 years ago
12

Using standard heats of formation, calculate the standard enthalpy change for the following reaction.

Chemistry
1 answer:
Katena32 [7]3 years ago
4 0

Answer:

ΔH°r = -483.64 kJ

Explanation:

Let's consider the following balanced equation.

2 H₂(g) + O₂(g)  ⇒ 2 H₂O(g)

We can calculate the standard enthalpy change of the reaction (ΔH°r) using the following expression.

ΔH°r = ∑ΔH°f(p) × np - ∑ΔH°f(r) × nr

where

ΔH°f: standard heat of formation

n: moles

p: products

r: reactants

ΔH°r = ΔH°f(H₂O(g)) × 2 mol - ΔH°f(H₂(g)) × 2 mol - ΔH°f(O₂(g)) × 1 mol

ΔH°r = (-241.82 kJ/mol) × 2 mol - 0 kJ/mol × 2 mol - 0 kJ/mol × 1 mol

ΔH°r = -483.64 kJ

You might be interested in
Consider the following mechanism for the formation of tert-butanol: (CH_3)_3CBr(aq) rightarrow (Ch_3)_3 C^+ (aq) + Br^- (aq) (CH
Sloan [31]

Answer:

The mechanism is in the attached file. The reaction intermediates are the following: C4H8O, C4H9O

Explanation:

Terbutanol is a tertiary alcohol. It is one of the four isomers of butanol. It is a transparent liquid (or a colorless solid, depending on the temperature), with an odor similar to camphor. It is very soluble in water and ethanol.

The scheme shows a protonation of the double bond and the nucleophilic attack of the water to the carbocation, then it loses a proton and the terbutanol is formed.

Download pdf
4 0
3 years ago
Convert 24 cm to the unit km
podryga [215]
K H D b d c m
So 10000 cm in a Km
A
6 0
4 years ago
Read 2 more answers
Plants and animals depend on glucose (C6H12O6) as an energy source. Calculate the number of moles of each element in 1.25 mol C6
Aleksandr-060686 [28]

Answer:

15 mol.

Explanation:

trust

4 0
3 years ago
True or false: atoms are electrically neutral; that is they do not have a charge.
AfilCa [17]
Its true, By definition, an atom is electrically neutral<span> it has the same number of protons as it does electrons, plus some number of neutrons depending on the isotope</span>
3 0
3 years ago
Barium chloride emits a green color when flame tested. What can be said about the wavelength of light it emits?
spin [16.1K]

The complete question is as follows: Barium chloride (BaCl2) emits a green color when flame tested. What can be said about the wavelength of light it emits? Select all that apply.

A) The thermal energy is transferred to the outer electrons of the barium ions.

B) The electrons gain enough energy to excite them to a higher energy level.

C) The electrons drop back down to their ground state, gaining energy.

D) The electrons release energy emitting a wavelength of 500-560 nm, corresponding to a green light, when going back to their ground state.

Answer: The following can be said about the wavelength of light that Barium chloride emits:

  • The thermal energy is transferred to the outer electrons of the barium ions.
  • The electrons gain enough energy to excite them to a higher energy level.
  • The electrons release energy emitting a wavelength of 500-560 nm, corresponding to a green light, when going back to their ground state.

Explanation:

As barium chloride is emitting green color when flame tested. This means that thermal energy is being transferred to the outer electrons of barium ions.

A visible light is emitted by a substance when its electrons move from a region of higher energy level to lower energy level. This is because energy is given off by the electrons when they move in a lower region.

This is only possible when the electrons gain enough energy to excite them to a higher energy level.

Also, the electrons release energy emitting a wavelength of 500-560 nm, corresponding to a green light, when going back to their ground state.

Thus, we can conclude that following can be said about the wavelength of light that Barium chloride emits:

  • The thermal energy is transferred to the outer electrons of the barium ions.
  • The electrons gain enough energy to excite them to a higher energy level.
  • The electrons release energy emitting a wavelength of 500-560 nm, corresponding to a green light, when going back to their ground state.
5 0
3 years ago
Other questions:
  • Which types of electron orbitals will have higher energy than a 4d orbital?
    9·1 answer
  • Which of the following types of energy equals the total energy of motion and position
    9·1 answer
  • At the base of a frictionless icy hill that rises at 25.0∘ above the horizontal, a toboggan has a speed of 11.5 m/s toward the h
    9·1 answer
  • Which of the following 100.0-g samples contains the greatest number of atoms?a.Magnesiumb.Zincc.Silverd.Calciume.All samples con
    11·2 answers
  • Maya wants to describe the climate in Naples fl,where she lives . Which sentence about climate is true?
    13·1 answer
  • A 0.56 M solution of AlCl₃ is determined to have a concentration of particles of 1.79 M. What is the van't Hoff factor for AlCl₃
    11·1 answer
  • What is the wavelength of a photon with an energy of 4.56 *10^-19 J
    7·2 answers
  • In the ground state, which atom has a completely filled valence electron shell?
    6·1 answer
  • In dry climates, people often dig wells to find additional sources of water
    9·2 answers
  • Which statement best describes a physical change?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!