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
Sonja [21]
3 years ago
12

Measurements show that the enthalpy of a mixture of gaseous reactants increases by 215. kJ during a certain chemical reaction, w

hich is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that -155. kJ of work is done on the mixture during the reaction.
Calculate the change in energy of the gas mixture during the reaction. Round your answer to 2 significant digits.


Is the reaction exothermic or endothermic?
Chemistry
1 answer:
Maslowich3 years ago
6 0

Answer:

1. The change in energy is 60KJ or 6.0 × 10^1 KJ

2. Endothermic reaction

Explanation:

The Enthalpy (ΔU) for the mixture is given as 215kJ and the workdone (W) on the mixture is - 155KJ. Hence, the change in the energy (ΔH) ofthe mixture is computed using the equation below:

ΔH = ΔU + w

Where,

ΔH= Change in energy

ΔU= Enthalpy change

W= workdone

Therefore ΔH is:

ΔH= 215 kJ + (-155Kj)

ΔH= 60 KJ

Therefore, the change in energy is 60KJ or 6.0 × 10^1 KJ

The value is positive so it is an endothermic reaction.

An endothermic reaction happens when the energy used to break the bonds in the reactants is higher than the energy given out when bonds are formed in the products. This means that the entire reaction takes in energy, hence there is a temperature decrease in the surroundings. Endothermic reactions cannot happen spontaneously. Work is usually done in order to get these reactions to occur. When endothermic reactions absorb energy, a temperature drop is measured by the reaction.

You might be interested in
Someone please help! this is the last question<br>I only need help with B.<br><br>​
ludmilkaskok [199]

1. mol ratio of Al(NO₃)₃ : Na₂CO₃ = 2 : 3

2. Na₂CO₃ as a limiting reactant

<h3>Further explanation</h3>

Given

Reaction

2 Al(NO₃)₃ + 3 Na₂CO₃ → Al₂(CO₃)₃ + 6 NaNO₃

Required

mol ratio

Limiting reactant

Solution

The reaction coefficient in the chemical equation shows the mole ratio of the components of the compound involved in the reaction (reactants and products)

1. From the equation mol ratio of Al(NO₃)₃ : Na₂CO₃ = 2 : 3

2. mol : coefficient of Al(NO₃)₃ : Na₂CO₃ = 2 mole/2 : 2 mole/3 = 1 : 0.67

Na₂CO₃ as a limiting reactant (smaller)

6 0
2 years ago
When a nucleus undergoes nuclear decay by gamma rays the atomic number of the element?
kifflom [539]
I believe that when a nucleus undergoes a nuclear decay by gamma rays the atomic number of element remains the same. Atomic number is the number of protons of a given atom of an element. Gamma decay unlike alpha and beta decay does not have an effect on the mass number and atomic number of an atom.
8 0
3 years ago
Is a landslide an example of erosion or weathering
Shtirlitz [24]

Answer:

It is a example of erosion

Explanation: because pieces of rock erode making it unstable a causes a landslide

7 0
3 years ago
if a substance is melted from a solid into a liquid, what property of the substance would also be effected? select all that appl
katen-ka-za [31]

Answer is: density of the substance, energy of the substance, intermolecular bonds between particles.

Melting is a physical change (process), the same substance is present before and after the change, so chemical bonds and melting point of the substance are not changed.

Density of liquids are usually less than in solids, because atoms are further apart.

Liquids have higher energy and atoms or molecules move faster.

Intermolecular bonds are weaker in liquids.

6 0
3 years ago
Read 2 more answers
Conduction is the transfer of energy by the movement of currents. ture or false <br>​
Mandarinka [93]

conduction is the transfer of energy by the movement of currents(it is true)

8 0
2 years ago
Read 2 more answers
Other questions:
  • How many atoms are in 2.5 moles of Br?
    11·1 answer
  • Which of the following is one way creativity can help scientists?
    5·2 answers
  • What dose plasma come from
    11·2 answers
  • Due Tomorrow!<br><br> What is [OH-] of a solution<br> with a pH of -1.0? <br><br> Answer in M
    7·1 answer
  • What happens when chlorine from<br> CFCs mixes with ozone?
    6·1 answer
  • Which of the following is what an elements are made of?
    6·1 answer
  • Do Acids increase the concentration of hydronium ions in solution by donating hydrogen ions to water molecules
    11·1 answer
  • Question 34 (1 point)
    15·1 answer
  • (Multiple choice) Of the following species, which is most likely to be oxidized?
    13·1 answer
  • What is the relationship between KMT and Sea Level Rise?<br> CER format<br> 3-4 sentences
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!