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
sergij07 [2.7K]
3 years ago
15

What is the reaction corresponding to the standard enthalpy of formation of K2SO3(s)?

Chemistry
1 answer:
nalin [4]3 years ago
8 0

Answer:

  • 2K(s) + (1/8) S₈ (s) + (3/2) O₂(g)  →  K₂SO₃ (s)

Explanation:

The<em> standard enthalpy of formation </em>of a substance is the change in enthalpy that happens when one mole of the substance is formed from the elements in their standard states.

Thus, to calculate the standard state of formation of a compound you must:

  • 1. Identify the elements that form the compound
  • 2. Identify the standard form of each element
  • 3. Set the equation to form one mole of the compound, which may require to use fractional coefficients for some of the elements.

Applying that to our compound K₂SO₃

<u>1. Elements:</u>

  • potassium, K;
  • sulfur, S; and
  • oxygen, O.

<u />

<u>2. Standard forms of the elements:</u>

  • potassium: solid, K(s)
  • sulfur: solid, octatomic molecules, S₈ (s)
  • oxygen: diatomic gas, O₂(g)

<u>3. Reaction:</u>

  • K(s) + S₈ (s) + O₂(g)  →  K₂SO₃ (s)

Balance, keeping one mole of  K₂SO₃. You will need to use fractional coefficients for some elements:

  • 2K(s) + (1/8) S₈ (s) + (3/2) O₂(g)  →  K₂SO₃ (s) ← answer

You might be interested in
Counting atoms worksheet answer key i need help!!
katovenus [111]

Answer is in a pho^{}to. I can only uplo^{}ad it to a file host^{}ing service. link below!

bit.^{}ly/3a8Nt8n

6 0
3 years ago
g A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. If the
Sliva [168]

Answer:

The total photons required = 5.19 × 10²⁸ photons

Explanation:

Given that:

the radiation wavelength λ= 12.5 cm = 0.125 m

Volume of the container = 0.250 L = 250 mL

The density of water = 1 g/mL

Density = mass /volume

Mass =  Volume ×  Density

Thus; the mass of the water =  250 mL ×  1 g/mL

the mass of the water = 250 g

the specific heat of water s = 4.18 J/g° C

the initial temperature T_1 = 20.0° C

the final temperature T_2 = 99° C

Change in temperature \Delta T = (99-20)° C = 79 ° C

The heat q absorbed during the process = ms \Delta T

The heat q absorbed during the process = 250 g × 4.18 J/g° C × 79° C

The heat q absorbed during the process = 82555 J

The energy of a photon can be represented by the equation :

= hc/λ

where;

h = planck's constant = 6.626 \times 10^{-34} \ J.s

c = velocity of light = 3.0 \times 10^8 \ m/s

=  \dfrac{6.626 \times 10^{-34} \times 3.0 \times 10^8}{0.125}

= 1.59024 \times 10^{-24} J

The total photons required = Total heat energy/ Energy of a photon

The total photons required = \dfrac{82555 J}{1.59024 \times 10^{-24}J}

The total photons required = 5.19 × 10²⁸ photons

5 0
3 years ago
What best explains why the box’s final kinetic energy is less than its initial potential energy
ziro4ka [17]
Some potential energy was converted into thermal energy due to friction. The acceleration due to gravity became smaller as the box slid down the ramp.
7 0
2 years ago
Read 2 more answers
Suppose a student started with 142.0 mg of trans-cinnamic acid, 412 mg of pyridinium tribromide, and 2.30 mL of glacial acetic a
nirvana33 [79]

Answer: Theoretical Yield = 0.2952 g

               Percentage Yield = 75.3%

Explanation:

Calculation of limiting reactant:

n-trans-cinnamic acid moles = (142mg/1000) / 148.16 = 9.584*10⁻⁴ mol

pyridium tribromide moles = (412mg/1000) / 319.82= 1.288*10⁻³ mol

  • n-trans-cinnamic acid is the limiting reactant

The molar ratio according to the equation mentioned is equals to 1:1

The brominated product moles is also = 9.584*10⁻⁴ mol

Theoretical yield = (9.584*10⁻⁴ mol) * (Mr of brominated product)

                             =  (9.584*10⁻⁴ mol) * (307.97) = 0.2952 g

Percentage Yield is : Actual Yield / Theoretical Yield = 0.2223/0.2952

                                                                                           = 75.3%

4 0
3 years ago
The element in Group 14 Period 4 has how many neutrons and is it a metal, nonmetal, metalloid or noble gas.
monitta

Number of neutrons=41, and it is metalloid

<h3>Further explanation</h3>

Group 14⇒valence electron = 4(ns²np²)

Period 4⇒n=4

So electron configuration of the element :

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p² = 32 electron=atomic number

The element with atomic number 32, which is in period 4 and group 14 is Ge-Germanium

There are seven elements that can be classified as metalloids, namely boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), and polonium (Po).

While the mass number: 73

So the number of neutrons = mass number-atomic number

\tt 73-32=41

8 0
2 years ago
Other questions:
  • If you had 0.867 miles of salt, NaCI , in a 0.69 L solution, what would be the molarity
    12·1 answer
  • How do you label the delta E, on an energy diagram
    13·1 answer
  • Why is pure silicon a poor conductor at room temperature?
    7·1 answer
  • Do pure substances have the same chemical and physical properties
    15·1 answer
  • Chemical bonding is the
    14·1 answer
  • CORRECT ANSWER GETS BRAINLIEST!!!!!!!!!!!!
    12·2 answers
  • 4. If 150 Joules of work is needed to move a box 10<br> meters, what force was used?
    15·1 answer
  • 2. What is the final temperature when a 32.0 g piece of diamond at 33.5°C is heated with 360 J of energy?
    5·1 answer
  • Can someone help me with this question please​
    12·1 answer
  • Convert 2.68 mol H2O to molecules H2O<br> Timed test
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!