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
kakasveta [241]
3 years ago
5

Use the formation reactions below such that when added together, they match the balanced equation for the combustion of methane.

Chemistry
1 answer:
muminat3 years ago
7 0

Answer:

ΔH of the reaction is -802.3kJ.

Explanation:

Using Hess's law, you can know ΔH of reaction by the sum of ΔH's of half-reactions.

Using the reactions:

<em>(1) </em>Cgraphite(s)+ 2H₂(g) → CH₄(g) ΔH₁ = −74.80kJ

<em>(2) </em>Cgraphite(s)+ O₂(g) → CO₂(g) ΔH₂ = −393.5k J

<em>(3) </em>H₂(g) + 1/2 O₂(g) → H₂O(g) ΔH₃ = −241.80kJ

The sum of (2) - (1) produce:

CH₄(g) + O₂(g) → CO₂(g) + 2H₂(g) ΔH' = -393.5kJ - (-74.80kJ) = -318.7kJ

And the sum of this reaction with 2×(3) produce:

CH₄(g) + 2 O₂(g) → CO₂(g) + 2H₂O(g) And ΔH = -318.7kJ + 2×(-241.80kJ) =

<em>-802.3kJ</em>

You might be interested in
Pls answer I am giving lots of points and need all the work shown. Determine the kb for chloroform when 0.793 moles of solute in
navik [9.2K]

Answer:0.87

Explanation:

8 0
3 years ago
Do any of the spheres exist on their own or are they intertwined?
Sauron [17]

Answer:

show me a pic of the problem

Explanation:

show me a pic of the problem

3 0
2 years ago
2. Potassium is a metal with one valence electron. With which other elements does it form bonds? a elements with one electron b.
Anika [276]

Answer:

Atoms with one or two valence electrons more than a closed shell are highly reactive ... Hydrogen can form bonds to many other elements such as nitrogen NH 3 ... the electron dot structure and iii the chemical K 1 valence electron 1 dot K . B two. ... The alkaline earth metals IIA elements lose two electrons to form a 2 cation.

Explanation:

6 0
2 years ago
Minerals are grouped according to their
tino4ka555 [31]

Answer:

chemical composition

3 0
3 years ago
If 100.0g of nitrogen is reacted with 100.0g of hydrogen, what is the excess reactant? What is the limiting reactant? Show your
Drupady [299]

N₂ : limiting reactant

H₂ : excess reactant

<h3>Further explanation</h3>

Given

mass of N₂ = 100 g

mass of H₂ = 100 g

Required

Limiting reactant

Excess reactant

Solution

Reaction

<em>N₂+3H₂⇒2NH₃</em>

mol N₂(MW=28 g/mol) :

\tt mol=\dfrac{mass}{MW}=\dfrac{100}{28}=3.571

mol H₂(MW= 2 g/mol) :

\tt mol=\dfrac{100}{2}=50

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and small or exhausted reactans become a limiting reactants

From the equation, mol ratio N₂ : H₂ = 1 : 3, so :

\tt \dfrac{3.571}{1}\div \dfrac{50}{3}=3.571\div 16.6

N₂ becomes a limiting reactant (smaller ratio) and H₂ is the excess reactant

5 0
2 years ago
Other questions:
  • PLZ HELP ASAP!!!
    15·1 answer
  • How many carbon atoms are in 4.00g of butane
    12·2 answers
  • A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.
    11·1 answer
  • How do I figure out polarity? thanks!​
    6·2 answers
  • Calculate the vapor pressure of spherical water droplets of radius (a) 17 nm and (b) 2.0 μm surrounded by water vapor at 298 K.
    14·1 answer
  • The density of water at 4 degrees Celsius is 1.00 g/cm cubed at unknown object has density of 7.9 g/cm cubed would you expect it
    11·1 answer
  • Which of the following explains the process of radiation?
    10·1 answer
  • 3. 2 HCl (aq)
    6·1 answer
  • Helppppppppppppppppp​
    5·1 answer
  • A compound has an empirical formula C₂H4S.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!