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
maw [93]
3 years ago
9

A quantity of 1.922 g of methanol (CH3OH) was burned in a constant-volume bomb calorimeter. Consequently, the temperature rose b

y 5.72°C. If the heat capacity of the bomb plus water was 9.47 kJ / °C, calculate the molar heat of combustion of methanol.
Chemistry
1 answer:
dezoksy [38]3 years ago
5 0

Answer:

872.28 kJ/mol

Explanation:

The heat released is:

ΔH = C*ΔT

where ΔH is the heat of combustion, C is the heat capacity of the bomb plus water, and ΔT is the rise of temperature. Replacing with data:

ΔH =  9.47*5.72 = 54.1684kJ

A quantity of 1.922 g of methanol in moles are:

moles = mass / molar mass

moles = 1.992/32.04 = 0.0621 mol

Then the molar heat of combustion of methanol is:

ΔH/moles = 54.1684/0.0621 = 872.28 kJ/mol

You might be interested in
If you added 15,000 calories to 2.0 L of water that was at 25.0 degrees C, what temperature would it be at when you finished?
rewona [7]

<u>Answer:</u>

<em>When we finish, the temperature would be 32.5℃</em>

<em></em>

<u>Explanation:</u>

Density of water = mass/volume

So,

Mass of water = Density × Volume

\\\\$=1.0   \times  2.0 L$\\\\$=1.0 \frac{g}{m L} \times 2000 m L$\\\\$\quad=2000 g$

$Q=m \times c \times \Delta T$

where

\Delta T = Final T - Initial T

Q is the heat energy in calories

c is the specific heat capacity (for water 1.0  cal/(g℃))  

m is the mass of water

plugging in the values  

$15000 \mathrm{Cal}=2000 \mathrm{g} \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times \Delta T$

\\$\Delta T=\frac{15000 \mathrm{cal}}{2000 \mathrm{g} \times \frac{1.0 \mathrm{cal}}{g^{\circ} \mathrm{C}}}$\\\\$\Delta T=7.5^{\circ} \mathrm{C}$

Final T = ∆T + Initial T

= 7.5℃ + 25℃ = 32.5℃ (Answer).

5 0
3 years ago
How is earths moon different from the moons of other planets
Sedaia [141]
The earths moon is most like going to differ in size or even color
6 0
3 years ago
Read 2 more answers
Which section of the reaction represents the reactants
Diano4ka-milaya [45]
A should be the products and D should be the reactants. So D should be the answer.
8 0
3 years ago
Green light has a frequency of about 6.00×1014s−1 . What is the energy of a photon of green light?
murzikaleks [220]
3.25 C because I said so and energy is green
8 0
2 years ago
A salt forms in the reaction of barium with chlorine. What is the most likely formula unit of this salt?
Scrat [10]
The answer to this question would be: BaCl 2
Barium is an alkali metal with 56 atomic number. Barium located in the group 2 of the periodic table because it has 2 valence electrons. Chlorine is a nonmetal that has 1 valence electron. When react, it would need 2 chlorine for each barium as the valence electron of barium is twice the chlorine. 
6 0
3 years ago
Read 2 more answers
Other questions:
  • Calculate the density, in grams per liter, of hydrogen sulfide gas, h2s, at 56oc and 967 mmhg. [1] g/l
    8·1 answer
  • A fluorine ion has 9 protons and a charge of –1. How many electrons are in an ion of fluorine?
    10·2 answers
  • Gay-Lussac's law states:
    11·1 answer
  • The total bonding energy for the products of a reaction is 2535 kJ/mol and the bonding energy of the reactants is 1375 kJ/mol. C
    12·1 answer
  • How many orbitals in total are in 2s2p?
    9·1 answer
  • Consider two flasks at 25 degree Celsius, one contains an ideal gas and the other contains the real gas SO3. Which statement reg
    14·1 answer
  • Help with this too!!!!!
    15·1 answer
  • Need to finish TODAY ASAP! HIgh point questions
    6·2 answers
  • Fish, amphibians, reptiles, birds, and mammals have similar embryos. They all start with gill slits. Fish and some amphibians gr
    5·1 answer
  • What is 2 H2 + 1 O2 = 2 H2O balanced?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!