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
ruslelena [56]
3 years ago
5

Combustion of 7.54 g of liquid benzene (C6H6) causes a temperature rise of 50.3°C in a constant-pressure calorimeter that has a

heat capacity of 6.27 kJ/°C. What is ∆H for the following reaction?C6H6(l) + O2(g) → 6CO2(g) + 3H2O(l)
Chemistry
1 answer:
Iteru [2.4K]3 years ago
4 0

Answer:

-3268 kJ/mol

Explanation:

The calorimeter is an equipment used to measure the heat from a combustion reaction. The heat can be calculated by:

Q = C*ΔT

Where Q is the heat, C is the heat capacity of the calorimeter, and ΔT is the variation of the temperature. So:

Q = 6.27 * 50.3

Q = 315.381 kJ

Because the calorimeter is adiabatic, the heat absorbed by it must be equal to the heat released for the reaction, so the heat of the reaction is:

Q = -315.381 kJ

The change in enthalpy (ΔH) is the heat divided by the number of moles of the limiting reactant. The combustion is commonly done with oxygen in excess, so benzene is the limiting reactant. Benze has a molar mass equal to 78.11 g/mol, so the number of moles is:

n = mass/molar mass

n = 7.54/78.11

n = 0.0965 moles

ΔH = Q/n

ΔH = -315.381/0.0965

ΔH = -3268 kJ/mol

You might be interested in
2. The transfer of heat by direct contact. What kind of heat transfer is this an example of? ​
dmitriy555 [2]

Answer:

The answer is Conduction

Explanation:

Conduction is the process of heat being transferred between objects through direct contact, and it's the most common type of heat transfer.

8 0
2 years ago
Read 2 more answers
Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of co
DedPeter [7]
The law of conservation of mass dictates that the total mass of reactants must be equal to the total mass of the products. Thus:
mass(MgO) = mass(Mg) + mass(O)
mass(MgO) = 24 + 16
mass(MgO) = 40 g

The third option is correct.
4 0
3 years ago
Read 2 more answers
Explain the reaction of metals with water.<br><br>​
telo118 [61]

Answer:

it rusts

Explanation:

4 0
3 years ago
Sulfur dioxide gas (SO2) reacts with excess oxygen gas (O2) and excess liquid water (H2O) to form liquid sulfuric acid (H2SO4).
inessss [21]
A.2SO₂ + O₂ + 2H₂O → 2H₂SO₄
B.Moles of SO₂ = 67.2 / 22.4Moles of SO₂ = 3 molesMoles of H₂SO₄ = 3 molesMass of H₂SO₄ = 3 x 98Mass of H₂SO₄ = 294 grams
Assuming sulfuric acid to have the same density as water,density = 1000 g / LVolume = mass / densityVolume = 294 / 1000Volume = 0.29 liters of sulfuric acid

6 0
3 years ago
Read 2 more answers
The common name for butanone, a readily available solvent, is ​
kobusy [5.1K]
The answer is ethyl methyl ketone.
8 0
3 years ago
Read 2 more answers
Other questions:
  • Is It Deadly To Mix Bleach, Rubbing Alcohol, And/or Hydrogen Peroxide?
    11·2 answers
  • What is the percent composition of potassium in KNO3
    5·2 answers
  • Maple syrup, which comes from the sap of maple trees, contains water and natural sugars. It's a clear, brown liquid and the suga
    6·2 answers
  • How does breaking up a solid speed dissolving in a liquid? A. increases the surface area B. decreases the surface area C. decrea
    12·1 answer
  • Two or more assistance
    13·1 answer
  • What are solids at room temperature and conduct electricity and heat?
    7·1 answer
  • 14. Energy (heat) is always transferred from ___ energy to ___ energy
    8·1 answer
  • 2 moles of substance A contains 12.04 × 1023 atoms.
    7·1 answer
  • The partial symbol for a particular ion is 26M2+ What are the number of electrons contained in one ion
    12·1 answer
  • How is the kinetic energy of the particles that make up a substance different after is changes state
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!