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
What two things combine with oxygen to form ground-level ozone?
STALIN [3.7K]

Answer:

c) NOx and VOC

oxides of nitrogen (NOx) and volatile organic compounds (VOC)

Explanation:

-

4 0
3 years ago
If you have studied the chemistry of fats can you identify the end arrangement found in fatty acids as well as amino acids? What
White raven [17]
Answers:
1) - COOH
2) carboxyl group

The organic acids contain the carboxyl group: - COOH.

Fats are structures composed by fatty acids. Fatty acids are long aliphatic chains with a carboxyl group at the end.

Aminoacids are chains that contains amine group (NH2) at one end and the carboxyl group at the other end.

Then both aminoacids and fatty acids contain the carboxyl group (-COOH) at one end.
8 0
3 years ago
HELP ASAP! GIVING BRAINLIEST!
Lapatulllka [165]
Potential I think because if the rubber band is being held and stretched them that’s all potential
8 0
3 years ago
Read 2 more answers
what do Mars, Mercury, and Venus have in common? A. They have a gas surface composition and a thick atmosphere. b They have many
mario62 [17]

Answer:

the best guess would have to be C

3 0
2 years ago
The Ka for acetic acid (HC2H3O2) is 1.80 x 10-5 . Determine the pH of a 0.0500mol/L acetic acid solution.
TiliK225 [7]

Answer:

pH = 3.02

Explanation:

Acetic Acid is a weak acid (HOAc) that ionizes only ~1.5% as follows:

HOAc ⇄ H⁺ + OAc⁻.

In pure water the hydronium ion concentration [H⁺] equals the acetate ion concentration [OAc⁻] and can be determined* using the formula [H⁺] = [OAc⁻] = SqrRt(Ka·[acid]) = SqrRt(1.8x10⁻⁵ x 0.0500)M = 9.5x10⁻⁴M.

By definition, pH = -log[H⁺] = -log(9.5x10⁻⁴) = 3.02

______________________________________________________

*This formula can be used to determine the [H⁺] & [Anion⁻] concentrations for any weak acid in pure water given its Ka-value and the molar concentration of acid in solution.

8 0
3 years ago
Other questions:
  • A balloon contains 0.5 L of air at 273 K. Its volume increases to volume of 0.75 L at constant pressure. What is the temperature
    11·1 answer
  • carbon disulfide is formed by the reaction of coke (carbon) with sulfur dioxide. how many moles of cs2 will be generated if 8.0
    14·1 answer
  • Is oxygen gas (O2) a compound or an element? Is hydrogen gas (H2) a compound or an element?
    13·1 answer
  • Determine the average rate of decomposition of h3po4 between 10.0 and 40.0 s. express your answer with the appropriate units.
    6·1 answer
  • What is generally true about the particles in a liquid?
    6·2 answers
  • A student comes to the conclusion that solids are denser than liquids. Is this true? Explain.
    14·1 answer
  • In which color coded area would you find an element that behaves both like a metal and a non-metal?
    14·1 answer
  • Which of the following descriptions of the storage requirements for alkali metals is the most accurate? Select the correct answe
    5·1 answer
  • The table below shows various solutions with their pH values. Use it to answer the questions that
    6·1 answer
  • What happens when the south end of Earth’s axis is tilted toward the Sun?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!