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
amid [387]
3 years ago
13

One gram of liquid benzene is burned in a bomb calorimeter. The temperature before ignition was 20.826 C, and the temperature af

ter the combustion was 25.000 C. This was an adiabatic calorimeter. The heat capacity of the bomb, the water around it, and the contents of the bomb before the combustion was 10 000 J K 1. Calculate fH for C6H6(l) at 298.15 K from these data. Assume that the water produced in the combustion is in the liquid state and the carbon dioxide produced in the combustion is in the gas state.
Chemistry
1 answer:
Licemer1 [7]3 years ago
4 0

Answer:

fH = - 3,255.7 kJ/mol

Explanation:

Because the bomb calorimeter is adiabatic (q =0), there'is no heat inside or outside it, so the heat flow from the combustion plus the heat flow of the system (bomb, water, and the contents) must be 0.

Qsystem + Qcombustion = 0

Qsystem = heat capacity*ΔT

10000*(25.000 - 20.826) + Qc = 0

Qcombustion = - 41,740 J = - 41.74 kJ

So, the enthaply of formation of benzene (fH) at 298.15 K (25.000 ºC) is the heat of the combustion, divided by the number of moles of it. The molar mass od benzene is: 6x12 g/mol of C + 6x1 g/mol of H = 78 g/mol, and:

n = mass/molar mass = 1/ 78

n = 0.01282 mol

fH = -41.74/0.01282

fH = - 3,255.7 kJ/mol

You might be interested in
Each glucose molecule consists only of carbon, hydrogen, and oxygen atoms. If each molecule contains 53.3% oxygen and 6.7% hydro
MAVERICK [17]
53.3% + 6.7% = 60%, 100% - 60% = 40%. 40% of glucose is made of carbon. Since there are only three types of atoms in glucose, and the amount of hydrogen and oxygen is already given, this means that whatever percentage is left (40%) has to be carbon.
8 0
3 years ago
What is the atomic number of xenon, the fifith element in group 18?
Agata [3.3K]
The atomic number is also the number of protons in the nucleus of an atom of a specific element, in this case Xenon. Xenon is represented on the periodic table as Xe. Find that and look at the number in the top center of the square for Xenon. In this case, the atomic number is 54.
6 0
3 years ago
What do you call a bond between two neutral atoms that share electrons
Katyanochek1 [597]


A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms

6 0
3 years ago
Read 2 more answers
Of the below gases, which would deviate most from ideal gas behavior? CO O2 NH3 SF4
Vlad [161]

Answer:

For gases such as hydrogen, oxygen, nitrogen, helium, or neon, deviations from the ideal gas law are less than 0.1 percent at room temperature and atmospheric pressure. Other gases, such as carbon dioxide or ammonia, have stronger intermolecular forces and consequently greater deviation from ideality.

Explanation:

8 0
3 years ago
In most turbochargers, the lubricating oil comes A. from an internal engine resevoir. B. under pressure through lines in the eng
nlexa [21]
I’m not sure, but I think A. from an internal engine reservoir
8 0
3 years ago
Other questions:
  • Is a theory testable, yes or no?
    5·1 answer
  • Explain how atoms(ions) are held together in an ionic bond. Give an example of an ionic compound
    7·2 answers
  • Why does halite cause ice water to get colder?
    5·1 answer
  • If helium does not obey the octet rule, then why do it<br> atomsnot react?
    15·1 answer
  • How can you tell if something is a mixture of a pure substance
    8·1 answer
  • Cuantos mililitros de HC10.1M contiene 0.025 mol de HC1
    12·1 answer
  • A 100kg sumo wrestler named Bob is doing his daily run. He runs at a velocity of 8m/s. After the run Bob stops for a rest, and s
    15·1 answer
  • NH, (aq) + H.,000
    8·1 answer
  • What makes up most of an atom?
    15·2 answers
  • Bo<br> A classroom warms up after<br> the students enter from PE
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!