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
m_a_m_a [10]
3 years ago
9

When the fuel mixture contained in a 1.49 l tank, stored at 750 mmhg and 298 k, undergoes complete combustion, how much heat is

emitted? (assume that the water produced by the combustion is in the gaseous state.)?
Chemistry
1 answer:
Ket [755]3 years ago
4 0
Get to know first how many moles in the gas:n = pV/RT= (1.013*10^5*750/760) Pa *1.49*10^-3 m^3/(8.314 J/(molK)*298) n = 0.0601 moles. 
The combustion energies  are  889 kJ/mol (methane) and 2 220 kJ (propane) x = moles methane, y = moles propane 
x*889 + y*2220 = 778 x + y = 0.0601----------- x = 0.267784 moles = 0.267784*100/0.0601 = 44.6 % y = 0.243216 moles = 0.243216*100/0.0601 = 55.4 %
You might be interested in
Ammonia is oxidized with air to form nitric oxide in the first step of the production of nitric acid. Two principal gas-phase re
nevsk [136]

Answer:

4NH₃(g)  + 5O₂(g)  →  4NO(g)  +  6H₂O

2NO(g) + O₂(g) → 2 NO₂

Explanation:

First of all, we need to consider the reaction for production of ammonia. In this reaction we have as reactants, nitrogen and hydroge.

3H₂ (g) +  N₂(g)  →  2NH₃ (g)

Afterwards, ammonia reacts to oxygen, to produce NO and H₂O

The equation for the process will be:

4NH₃(g)  + 5O₂(g)  →  4NO(g)  +  6H₂O

Then, we take the nitric oxide to make it react, to produce NO₂, in order to produce nitric acid, for the final reaction:

2NO(g) + O₂(g) → 2 NO₂

3NO₂(g) + H₂O(g) → 2 HNO₃ (g) + NO(g)

3 0
3 years ago
What type of chemical bond holds NaCI, an ionic crystal, together?
mihalych1998 [28]
Ionic bonds hold NaCl together
3 0
2 years ago
Read 2 more answers
Which statement describes an example of destruction interference?
Marianna [84]
Answer: B

Step by Step Explanation:
4 0
3 years ago
Identify two acids and two bases that you use or come into contact with in an average week. Identify uses for each substance.
skelet666 [1.2K]

Explanation:

Two acids we come into contact with in an average week

  1. Vinegar is an 10% solution of acetic acid (CH_3COOH)in water. Used in salad dressing and while cooking food. It has a sour taste.
  2. Citric acid present in fruits and vegetables like : lemons, orange, tomatoes etc. It is a weak organic acid with sour taste.

Two bases we come into contact with in an average week.  

  1. Baking soda (NaHCO_3) is used in baking food like: cakes, cookies, breads. Baking soda is one of the ingredient while baking breads and cakes.
  2. Caustic soda (NaOH) is used for preparation of detergents, papers , soaps etc. We use soaps and detergents for washing.
4 0
3 years ago
Read 2 more answers
Why we need gravity explain in your own words​
Harlamova29_29 [7]

Answer:

Gravity is very important for us,animals and plants. We could not survive Earth without it. The sun's gravity keeps Earth in orbit around it, keeping us a good distance away from it (the sun). Gravity is holding down our atmosphere and the air we need to breathe along with it.

7 0
2 years ago
Other questions:
  • Scientists infer that early North American humans hunted the mastodon. Carbon-14 dating of the rib bone indicates that 2.4 half-
    12·1 answer
  • What happens to the density of most substances as they cool and solidify?
    5·1 answer
  • What is the mass, in grams, of solute in 255mL of a 0.0525M solution of KMnO4 (MM =
    15·1 answer
  • PLEASE explain your answer!!!!​
    8·1 answer
  • hat is the relationship between the vapor pressure of a liquid and the measured pressure of the gas above the liquid at a given
    6·1 answer
  • Help me, please
    5·1 answer
  • What are the thee types of weak bonding ​
    11·1 answer
  • When should a line graph be used
    5·1 answer
  • Which personal trait do scientists mainly depend upon when they design an experiment
    6·1 answer
  • Difference between word equation and formula equation in table​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!