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
Why is the liquid oxygen machine producing less liquid oxygen than normal?
Nataly_w [17]

Answer:

Liquid oxygen evaporates at only a slightly higher temperature than liquid nitrogen because they have similarly low attraction between molecules. This would mean less liquid oxygen is coming out of tank 3 because some of it is evaporating as a gas instead.

5 0
2 years ago
Read 2 more answers
What the answer I’m on a midterm and can’t seem to find it help
Sonja [21]

Answer:

Sorry I’m not rlly sure but maybe the 2nd or the last

Explanation:

8 0
3 years ago
Calculate the molar solubility of fe(oh)2 in pure water. (the value of ksp for fe(oh)2 is 4.87×10−17.)
rosijanka [135]
When we have this balanced equation for a reaction:
Fe(OH)2(s) ↔ Fe+2  + 2OH-

when Fe(OH)2 give 1 mole of Fe+2 & 2 mol of OH-
so we can assume [Fe+2] = X and [OH-] = 2 X
 when Ksp = [Fe+2][OH-]^2
and have Ksp = 4.87x10^-17 
[Fe+2]= X
[OH-] = 2X
so by substitution 
4.87x10^-17 = X*(2X)^2
∴X^3 = 4.8x10^-17 / 4
∴the molar solubility X = 2.3x10^-6 M
3 0
3 years ago
The use of uranium-238 to determine the age of a geological formation is a beneficial use of
tester [92]

Answer:

4- radioactive isotopes

Explanation:

I don't remember exactly but this question was on the regents

3 0
2 years ago
PLEASE HELP!! WILL GIVE 5 STARS, A THANKS AND BRAINLIEST
Neporo4naja [7]

Answer:

"Carbon dioxide (CO2) is one of a number of gases that are transparent to the visible light falling on the Earth from the Sun, but absorb the infra-red radiation (heat) emitted by the warm surface of the Earth, preventing its loss into space. During the geological history of the Earth the level of atmospheric CO2 has varied considerably and this has had an impact on the global temperature. A significant amount of this atmospheric carbon was sequestered or (removed from the atmosphere) and turned into inert material (coal, and oil) typically 300-360 Million years ago. All of the global ecosystems and species have adapted to a lower level of atmospheric CO2 and critically, human civilisation has also grown since that period.  Since the industrial revolution humans have been burning sequestered CO2 in the form of coal, oil, and natural gas which has the result of releasing energy but also releases CO2 back into the atmosphere".

7 0
3 years ago
Other questions:
  • A gene which does not produce its effect when an opposite dominant gene is present is called a(n) ________ gene
    12·2 answers
  • How do you find the mass of original KClO3 sample
    12·1 answer
  • 1. Or what is the steering of a vehicle an example?
    11·1 answer
  • What is the molarity of a solution that has .8 mols of solute in .5 L of water?
    5·2 answers
  • Define essential elements and how many elements are required for life
    12·1 answer
  • Is steam a element compound, heterogeneous, mixture ,or solution?
    6·1 answer
  • A substance made of two or more atoms bonded together
    7·2 answers
  • If the forces acting on an object are unbalanced, what will occur?
    11·1 answer
  • When the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coeffici
    14·1 answer
  • How many questions would you need to separate ten arthropods into different branches
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!