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
Musya8 [376]
3 years ago
7

How is enthalpy used to predict whether a reaction is endothermic or exothermic?

Biology
1 answer:
Radda [10]3 years ago
3 0

<u>Answer:</u>

<em>329.48 KJ/mol heat is released by the combustion of 2 molof methane</em>

<u>Explanation:</u>

The value of enthalpy determines whether the reaction is exothermic or endothermic. If the enthalpy change is positive, then the reaction is endothermic (heat or energy released) and if the enthalpy change is negative then the reaction is exothermic (heat or energy absorbed).

2CH_4(g)+4O_2(g) => 2CO_2(g)+4H_2O(g)

\Delta H \ reaction=[ 2(\Delta HfCO_2)+ 4(\Delta HfH_2O)]-[2(\Delta HfCH_4)+4(\Delta HfO_2)]

                            =2 ( -(393.5 KJ)/mol)-[2( -74.6 KJ/mol)+4(-241.82 KJ/mol)]

                            = -787 KJ/mol-[ -149.2 KJ/mol-967.28 KJ/mol]

                           = -787 KJ/mol+1116.48 KJ/mol

                                          =329.48 KJ/mol

<em>In this question, </em><em>the enthalpy of formation</em><em> has positive value and hence the </em><em>reaction is endothermic</em><em> in which the heat is released. </em>

You might be interested in
Explain what nuclear, or atomic, process most likely results in geothermal energy. Also state why this nuclear energy will last
ELEN [110]

Explanation:

Nuclear energy does not produce electricity on its own. The nuclear energy it produces is used to heat water . The hot water then turns to steam that is used to turn dynamo turbines. This is thermal energy turned to mechanical energy.  The dynamo turbines turn the mechanical energy into electric energy.

Nuclear energy lasts longer because the same volume as compared to fossil fuels produced a larger magnitude of energy, million of magnitudes larger. Therefore with the controlled release of this enormous energy, nuclear energy can last much longer than fossil fuels.

Learn More:

For more comparisons between nuclear energy vs fossil energy check out;

brainly.com/question/9564636

brainly.com/question/7801962

brainly.com/question/5628547

brainly.com/question/9982762

brainly.com/question/10218784

brainly.com/question/7850572

brainly.com/question/1736879

brainly.com/question/3760263

brainly.com/question/3602665

#LearnWithBrainly

4 0
4 years ago
when algae lives on a slth it is consirered a mutual symbiotic relationship. why is this an exampkle of mutualism
d1i1m1o1n [39]

Algae living on a sloth is considered an example of mutualism because both of them benefit from each other.

Mutualism is one of the symbiotic relationships in which both the two species living together benefit in one way or another. A considerable example of such a relationship is between algae and a sloth.

The algae provide camouflage to the sloth and protect it from predators while the sloth provides shelter to the algae for its growth. The sloth also gets nutrition from algae which perform photosynthesis and synthesize food.

Another mutual relationship is observed between the aphids and ants. Aphids produce honeydew as a waste product of their diet which is consumed by ants. While ants protect the aphids from predators and parasites.

To know more about mutualism, refer to the following link:

brainly.com/question/94753

#SPJ4

4 0
1 year ago
The International Date Line roughly follows:
My name is Ann [436]
The answer is the 180 degree meridian
5 0
3 years ago
What are the subunits of protein, starch, and DNA
vesna_86 [32]
Well, basically, everything is made of atoms and cells. Those are youre building blocks for every life unit. The subunits of proteins are amino acids. These acids combine (in different combinations) to form different proteins.
The subunits of starch are carbohydrates. They build to form molecules of starch.
The subunits of DNA are nucleic acids. These mix with other things to form DNA. It is like the protein where different combinations create different DNA strands/molecules.
3 0
4 years ago
Read 2 more answers
Why are plants like grasse able to
timurjin [86]

Answer:

C.) The root may grow horizontal rhizomes that make new shoots.

Explanation:

Plants like grasses able to  reproduce more quickly than others because their roots grow horizontal rhizomes into a new shoots. These grasses spreads in the soil due to movement of rhizomes horizontally and grows its shoot with this movement. This spreading helps the grasses to make carpets in the grounds and has the ability to grow faster than other plants so we can say that growth of horizontal rhizomes is responsible for quick growth of grasses.

7 0
3 years ago
Other questions:
  • How do breeders produce new genetic variations not found in nature?
    5·1 answer
  • Which factor has greatest importance in determining the characteristics of an aquatic ecosystem? A. day length B. water depth C.
    9·2 answers
  • The hormone epinephrine binds to ß adrenergic receptors on smooth muscle cells of the bronchioles, causing them to dilate (incre
    11·2 answers
  • 1. Name the three types of bees typically found in a colony:​
    15·1 answer
  • What is The complement system is a barrier of the immune system.
    14·1 answer
  • HELp!!!! LIKE NOW PLZ
    6·1 answer
  • Based on the article "Will the real atomic model please stand up?," why did J.J. Thomson experiment with cathode ray tubes?​
    5·1 answer
  • Earthquakes occur due to______.
    15·2 answers
  • Prairies, steppes, and pampas are types of
    8·1 answer
  • What's the function of pancreas?​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!