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
irga5000 [103]
2 years ago
13

A system does 125 J of work and cools down by releasing 438 J of heat. The change in internal energy is ____________ J.

Chemistry
1 answer:
Jet001 [13]2 years ago
8 0

Given that,

Work done by the system = 125 J

Energy released when it cools down = 438 J

To find,

The change in internal energy.

Solution,

As heat is released by the system, Q = -438 J

Work done by the system, W = -125 J

Using the first law of thermodynamics. The change in internal energy is given by :

\Delta U=Q-W\\\\=-438-125\\\\=-563\ J

So, the change in internal energy is 563 J.

You might be interested in
List the types of electricity
Lilit [14]
There are 2 types of electricity, static electricity and current electricity
7 0
2 years ago
Read 2 more answers
1. Complete the balanced dissociation equation for the compound below. If the compound does not dissociate, write NR after the r
puteri [66]

Answer:

1. (NH₄)₂S(s) -----> NH₄+(aq) + S²-(aq)

2. Al³+ (aq) + PO₄³+ (aq) ----> AlPO₄ (s)

Explanation:

The dissociation of ammonium sulphide, (NH₄)₂S when dissolved in water is given in the equation below:

(NH₄)₂S(s) -----> NH₄+(aq) + S²-(aq)

However very little S²- ions are present in solution due to the very basic nature of the S²- ion (Kb = 1 x 105).

The ammonium ion being a better proton donor than water, donates a proton to sulphide ion to form hydrosulphide ion which exists in equilibrium with aqueous ammonia.

S²- (aq) + NH₄+ (aq) ⇌ SH- (aq) + NH₃ (aq)

Aqueous solutions of ammonium sulfide are smelly due to the release of hydrogen sulfide and ammonia, hence, their use in making stink bombs.

2. The reaction between aluminium nitrate and sodium phosphatein aqueous solution is a double decomposition reaction whish results in the precipitation of insoluble aluminium phosphate. The equation of the reaction is given below :

Al(NO₃)₃ (aq) + Na₃PO₄ (aq) ----> AlPO₄ (s) + 3 NaNO₃ (aq)

The net ionic equation is given below:

Al³+ (aq) + PO₄³+ (aq) ----> AlPO₄ (s)

7 0
2 years ago
If 0.138g of cyclohexene (c6h10) was obtained from 0.240g of cyclohexanol (c6h120), what is the percentage yield of cyclohexene?
tino4ka555 [31]
<span>Given in the question- 1 mole of cyclohexanol = > 1 mole of cyclohexene Molar mass 100.16 g/mol moles of cyclohexanol = .240 / 100.16= 0.002396 moles Molar mass 82.143 g/mol moles of cyclohexene formed @100 % yield = 0.002396 Molar mass 82.143 g/mol mass of cyclohexene @ 100 % = .002396 x 82.143 = 0.197g bur we have .138g so % yield = .138 / .197 = 70.0 % Ans- 70 percentage yield of cyclohexene.</span>
4 0
3 years ago
What would be the number of oxygen atoms in 5.00 moles of co2?
malfutka [58]
Well theres 5 so times 2 equals 10

6 0
3 years ago
When metals react with acid, bubbles of what gas are produced?​
elena-14-01-66 [18.8K]

Answer:

hydrogen is the answer

5 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following statements is true concerning the reaction given below?2H2S(g) + O2(g) → 2S(s) + 2H2O(g)a. The reaction i
    11·1 answer
  • Individuals within populations exhibit some diversity. As a result of possessing slightly different traits, some individuals are
    12·2 answers
  • suppose you mix food coloring in water to make it blue. Have you made a solution or suspension. Explain........PLZ HELP
    15·1 answer
  • What is the relationship between protons and electrons in a neutral atom?
    6·1 answer
  • I need it now pleasee help
    8·1 answer
  • HELP FAST PLZ!!!!!!!!!!!!!_____ energy from the outlet transfers energy to the light bulband
    15·2 answers
  • What does the prefix non-represent?
    10·1 answer
  • When you apply heat energy to a substance, where does the energy go? Think about the law of conservation of energy.
    8·1 answer
  • Do you think it is still possible for the Church today to imitate the ways of the early Christians? Give reason for your answer.
    6·1 answer
  • In what way does ocean water move globally?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!