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loris [4]
3 years ago
13

A system receives 425 J of heat from and delivers 425 J of work to its surroundings. What is the change in internal energy of th

e system (in J)?
Chemistry
1 answer:
bixtya [17]3 years ago
7 0

Answer:

0 J

Explanation:

Applying,

ΔE = q+w................ Equation 1

Where ΔE = change in internal energy of the system, q = Heat of the system, w = work of the system.

Note: q is positive, while w is negative

From the question,

Given: q = 425 J, w = -425 J

Substitute these values into equation 1

ΔE = 425-425

ΔE = 0 J

Hence the change in internal energy of the system is 0 J

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Consider the following equilibrium for nitrous acid, HNO2, a weak acid: HNO2(aq) + H2O (l) —><— H3O+ (aq) +NO2^-(aq) In wh
Novosadov [1.4K]

Answer:

The equilibrium will shift to the right

Explanation:

The chemical equilibrium represents a balance between direct and inverse reactions.

The Le Chatelier Principle states that variations in experimental conditions can alter this balance and displace the equilibrium position, causing more or less of the desired product to form. And in this way the system evolves in the opposite direction so as to counteract the effects of such disturbance.

The variation of one or more of the following factors are those that can alter the equilibrium condition:

  • Temperature
  • The pressure
  • The volume
  • The concentration of reactants or products

In this case:

NaOH produces OH⁻ ions. OH⁻ ion uses up H₃O⁺  through the reaction:

H₃O⁺ + OH⁻ → 2 H₂O

According to the Le Chatelier principle, the addition of NaOH consumes one of the products, decreasing its concentration. Therefore, to balance the reaction, <u><em>the equilibrium will shift to the right</em></u> in order to counteract the effect that disturbed it and recover the equilibrium state.

4 0
3 years ago
How much 0.02 m kmno4 solution should be needed if the solutions tested have a composition of 3% h2o2 by mass?
Nostrana [21]
When the concentration is expressed in mass percentage, that means there is 3 g of solvent H₂O₂ in 100 grams of the solution. Then, that means the remaining amount of solute is 97 g. We use the value of molarity (moles/liters) to determine the amount of solution in liters, denoted as V. The solution is as follows:

0.02 mol KMnO4/L solution * 158.034 g KMnO4/mol * V = 97 g KMnO4

Solving for V,
V = 30.69 L
6 0
3 years ago
2. What effect does amount of water have on plant growth?
cluponka [151]

Answer:

2.

independent variable:amount of water

dependent variable:plant growth

3.

independent variable:student's bedtime

dependent variable: students energy level

4.

independent variable:exercise

dependent variable: strength

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independent variable:persons height

dependent variable:ability to play basketball

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8 0
3 years ago
Read 2 more answers
A 62.6-gram piece of heated limestone is placed into 75.0 grams of water at 23.1°C. The limestone and the water come to a final
VMariaS [17]
M₁ = mass of water = 75 g
T₁ = initial temperature of water = 23.1 °C
c₁ = specific heat of water = 4.186 J/g°C

m₂ = mass of limestone = 62.6 g
T₂ = initial temperature of limestone = ?
c₂ = specific heat of limestone = 0.921 J/g°C

T = equilibrium temperature = 51.9 °C
using conservation of heat
Heat lost by limestone = heat gained by water
m₂c₂(T₂ - T) = m₁c₁(T - T₁)
inserting the values
(62.6) (0.921) (T₂ - 51.9) = (75) (4.186) (51.9 - 23.1)
T₂ = 208.73 °C
in three significant figures
T₂ = 209 °C
7 0
4 years ago
For which of the following processes would S° be expected to be most positive? a) O2(g) + 2H2(g)  2H2O(g) b) H2O(l)  H2O(s) c
vaieri [72.5K]

Answer:

Explanation:

a) O₂(g) + 2H₂(g) = 2H₂O

b) H₂O(l) = H₂O(s)

c) NH₃(g) + HCl(g) =  NH₄Cl(g)

d) 2NH₄NO₃(s) =  2N₂(g) + O₂(g) + 4H₂O(g)

e) N₂O₄(g) =  2NO₂(g)

ΔS is positive when there is increase in disorderliness. It happens when there is increase in volume .

Increase is volume is maximus in the following reaction.

d) 2NH₄NO₃(s) =  2N₂(g) + O₂(g) + 4H₂O(g)

in this reaction solid NH₄NO₃ is changed to 7 x 22.4 L of gases so there is maximum increase in volume . Hence maximum increase in entropy . Hence ΔS is most positive .

6 0
3 years ago
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