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
kodGreya [7K]
3 years ago
6

4.000 g of Compound X with molecular formula C4H6 are burned in a constant-pressure calorimeter containing 40.00 kg of water at

25 °C. The temperature of the water is observed to rise by 1.065 °C. (You may assume all the heat released by the reaction is absorbed by the water, and none by the calorimeter itself.) Calculate the standard heat of formation of Compound X at 25 °C. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Chemistry
1 answer:
stiks02 [169]3 years ago
5 0

Answer:

2407 kJ/mol

Explanation:

Given:

Mass of water  = 40.00 kg

\Delta T  = 1.065 °C

Net Heat transfer during heating:

Q=m_{water}\times C_{water}\times \Delta T

Specific heat of water = 4.187 kJ/kg°C  

Q=40.00\times 4.187\times 1.065\ kJ

Q = 178.3662 kJ

Heat gained by water is heat lost by the compound. Thus, heat lost = 178.3662 kJ

Also,

Mass = 4.000 g

Molar mass of C_4H_6=4\times 12+6\times 1\ g/mol=54\ g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{4.000\ g}{54\ g/mol}

Moles= 0.0741\ mol

<u>Standard heat of formation = 178.3662 kJ / 0.0741 mol=2407 kJ/mol (In correct significant digits)</u>

You might be interested in
A solution of starch at room temperature does not readily decompose to form a solution of simple sugars because
Basile [38]

Explanation:

The starch requires a temperature higher than the room temperature (arround 60 °C) to decompose to form simple sugars. This is because the energy required to break the chemical bonds. Also, it may need the action of some specific enzymes (alpha and beta amilase) to break those bonds.

6 0
3 years ago
What is the bohr model for pottasium
guapka [62]
Potassium is an alkali metal with the chemical symbol K. It has an atomic number of 19, meaning that it has 19 positively charged protons. It also contains 19 electrons, which have a negative charge, and 20 neutrons, which do not hold a charge
Hope this help
7 0
3 years ago
Small molecules that bind with self-proteins to produce antigenic substances are called ________. Small molecules that bind with
Leona [35]

Answer:

Haptens.

Explanation:

Haptens are known as small molecules that help to stimulate the production of antibody molecules when attached with a large molecule known as a carrier molecule such as proteins.

Haptens are used to study the mechanism of inflammatory bowel disease to help induce the autoimmune type of responses and allergic contact dermatitis.

4 0
3 years ago
Compare and contrast: element, atom, isotope
blsea [12.9K]

Answer:

Element is made up of the atoms or isotopes. Isotopes are where only neutrons change in number, such as 3 turning to 2 or to 5. Atom is where it is not changed and it is the original, and example is instead of Carbon13 it is just Carbon. I hope this helps.

7 0
3 years ago
Read 2 more answers
Which term best describes a unit of carbon dioxide?
Lelechka [254]

Answer:

Molecule.

Explanation:

carbon and fluorine. Based on the bonding, a unit of carbon dioxideis described as a molecule.

7 0
2 years ago
Other questions:
  • Which is a property of an ideal gas?
    12·2 answers
  • What is a polar bond
    9·1 answer
  • Which solution is most dilute?
    8·1 answer
  • Calculate the volume occupied by 272g
    7·1 answer
  • Calculate the amount of water required to prepare 500g of 2.5% solution of sugar.
    5·1 answer
  • As long as there is some residual liquid present after equilibrium is reached, the vapor pressure of a liquid at any given tempe
    12·1 answer
  • Explain the effect of change in concentration of a system in Equilibrium with at least one example.
    10·1 answer
  • If you have 10g of Fe and 20 g of oxygen, how much product will you have?
    7·1 answer
  • What is the molarity of a solution made by adding :1.565 moles of PbN03 to 500 mL
    7·1 answer
  • The molecular formula and molar mass of two straight-chain hydrocarbons are listed in the table above. Based on the information
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!