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
Wittaler [7]
3 years ago
15

Which of the following combinations will result in a reaction that is spontaneous at all temperatures?

Chemistry
2 answers:
Katen [24]3 years ago
8 0

Answer:

\huge\boxed{Option \ 2}

Explanation:

A reaction is spontaneous at all temperatures by the following combinations:

=> A negative enthalpy change ( \triangle H < 0 )

=> A positive entropy change ( \triangle S > 0 )

See the attached file for more better understanding!

igomit [66]3 years ago
6 0

from Gibbs Equation, \Delta G = \Delta H - T\Delta S

reaction is spontaneous if $\Delta G$ is negative.

so, first option is not valid at high temperature, ($-h+ts$)

second, is always a spontaneous reaction, ($-h-ts$)

third, is never spontaneous ($+h+ts$)

4th is similar to second, spontaneous at higher temperatures ($+h-ts$)

You might be interested in
The addition of hydrochloric acid to a silver nitrate solution precipitates silver chloride according to the reaction:
Nimfa-mama [501]

Answer:

Enthalpy change for the reaction is -67716 J/mol.

Explanation:

Number of moles of AgNO_{3} in 50.0 mL of 0.100 M of AgNO_{3}

= Number of moles of HCl in 50.0 mL of 0.100 M of HCl

= \frac{0.100}{1000}\times 50.0 moles

= 0.00500 moles

According to balanced equation, 1 mol of AgNO_{3} reacts with 1 mol of HCl to form 1 mol of AgCl.

So, 0.00500 moles of AgNO_{3} react with 0.00500 moles of HCl to form 0.00500 moles of AgCl

Total volume of solution = (50.0+50.0) mL = 100.0 mL

So, mass of solution = (100.0\times 1.00) g = 100 g

Enthalpy change for the reaction = -(heat released during reaction)/(number of moles of AgCl formed)

= \frac{-m_{solution}\times C_{solution}\times \Delta T_{solution}}{0.00500mol}

= \frac{-100g\times 4.18\frac{J}{g.^{0}\textrm{C}}\times [24.21-23.40]^{0}\textrm{C}}{0.00500mol}

= -67716 J/mol

[m = mass, c = specific heat capacity, \Delta T = change in temperature and negative sign is included as it is an exothermic reaction]

4 0
3 years ago
The pKa of the α‑carboxyl group of serine is 2.21 , and the pKa of its α‑amino group is 9.15 . Calculate the average net charge
sleet_krkn [62]

Answer:

Net charge in serine at pH equal to 8.30 is "0"

Explanation:

  • At pH > pK_{a}, carboxyl group exists as -CO_{2}^{-} (charged)
  • At pH < pK_{a}, carboxyl group exists as -COOH (neutral)
  • At pH > pK_{a}, amino group exists as -NH_{2} (neutral)
  • At pH < pK_{a}, amino group exists as -NH_{3}^{+} (charged)
  • So, at pH = 8.30, both carboxyl and amino group exists in charged state.
  • Net charge in serine at pH equal to 8.30 is "0".
  • Structure of serine at pH equal to 8.30 has been shown below.

8 0
3 years ago
What is the mass (grams) of salt in 10.0 m' of ocean water? ball park-4x10's (1.000 molsalt -58.44 g salt, 1.0 L ocean water -0.
koban [17]

Answer:

3.5 × 10⁵ g of salt

Explanation:

<em>What is the mass (grams) of salt in 10.0 m³ of ocean water?</em>

We have this data:

  • 1.000 mol salt is equal to 58.44 g salt
  • 1.0 L of ocean water contains 0.60 mol of salt

We will need the following relations:

  • 1 L = 1dm³
  • 1 m³ = 10³ dm³

We can use proportions:

10.0m^{3} .\frac{10^{3}dm^{3}  }{1m^{3} } .\frac{1L}{1dm^{3} } .\frac{0.60molSalt}{1.0L} .\frac{58.44gSalt}{1molSalt} =3.5 \times 10^{5} gSalt

8 0
3 years ago
What do we call the harmful substances that have a negative effect on the environment? *
kumpel [21]

Answer: A.  Pollutants

Explanation:

"A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource. ..." - Wikipedia

3 0
3 years ago
Read 2 more answers
What’s love?why is it important ?
Leno4ka [110]

Answer:

It's the Key to All Relationships. At the basis of all other emotions within a relationship is the sensation of love. When you feel loved, you feel less pressure, less alone, less anxiety, more secure, more confident, and more important.

Explanation:

6 0
3 years ago
Other questions:
  • A 0.04358 g sample of gas occupies 10.0-ml at 292.0 k and 1.10 atm. upon further analysis, the compound is found to be 25.305% c
    7·2 answers
  • Convert 1.5 mol Na to mass
    10·1 answer
  • Why the mass of a rusted nail is greater than the mass of a nail before it rusted ? Explain
    5·2 answers
  • Classify each change as physical or chemical.
    11·1 answer
  • Equations can be balanced by using the half-reaction method. Which step should be completed immediately after finding the oxidat
    14·2 answers
  • Rank the following series of molecules or ions in order of decreasing bond energy using their bond order to predict relative mag
    5·1 answer
  • Calculate the mass of 3 moles of clorine​
    13·1 answer
  • In a coffee cup calorimeter, 1.60 g NH4NO3 was mixed with 75.0 grams of water at an initial temperature of 25.00* Celsius. After
    13·1 answer
  • What is the boiling point of gold?
    7·1 answer
  • Consider the hydrocarbon below. 2 carbons are double-bonded to each other; the pair are single bonded to h above left, above rig
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!