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3 years ago

When the liquid state and the gaseous state of a substance are in equilibrium the rate of evaporation is?

2 answers:

8 0

The rate of evaporation is equal to rate of condensation in equilibrium......It means the evaporation rate becomes constant.....And thus equilibrium attained !!!

pogonyaev3 years ago

3 0

Answer:

The liquid-vapor equilibrium is reached when the chemical potentials of the substance are equal in both phases at a certain temperature and pressure. The evaporation rate is equal to the condensation

Explanation:

The most important considerations in the liquid-vapor balance are the following:

-The vapor phase is considered an ideal gas mixture.

-The liquid phase is considered an ideal solution.

Said equilibrium state occurs when the steam pressure is reached. This depends on the temperature, the nature of the components and the composition in each phase. For example, consider an ideal solution, the vapor pressure will be proportional to the moles of each component in the liquid phase and the vapor pressure of the pure substance at a temperature, according to Raoult's law.

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A reaction has a rate constant of 2.08 × 10−4 s−1 at 26 oC and 0.394 s−1 at 79 oC . Determine the activation barrier for the rea

leva [86]

<u>Answer:</u> The activation energy of the reaction is 124.6 kJ/mol

<u>Explanation:</u>

To calculate activation energy of the reaction, we use Arrhenius equation, which is:

$\ln(\frac{K_{79^oC}}{K_{26^oC}})=\frac{E_a}{R}[\frac{1}{T_1}-\frac{1}{T_2}]$

where,

$K_{79^oC}$ = equilibrium constant at 79°C = $0.394s^{-1}$

$K_{26^oC}$ = equilibrium constant at 26°C = $2.08\times 10^{-4}s^{-1}$

$E_a$ = Activation energy of the reaction = ?

R = Gas constant = 8.314 J/mol K

$T_1$ = initial temperature = $26^oC=[26+273]K=299K$

$T_2$ = final temperature = $79^oC=[79+273]K=352K$

Putting values in above equation, we get:

$\ln(\frac{0.394}{2.08\times 10^{-4}})=\frac{E_a}{8.314J/mol.K}[\frac{1}{299}-\frac{1}{352}]\\\\E_a=124595J/mol=124.6kJ/mol$

Hence, the activation energy of the reaction is 124.6 kJ/mol

3 0

3 years ago

How molecules react to an increase in temperature.

Slav-nsk [51]

Answer:

An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).

Explanation:

8 0

3 years ago

Measuring levels of pollutants, such as nitrogen oxide in the atmosphere, is an example of chemistry research that ____.

Paraphin [41]

Answer:

aims to benefit the environment is the correct answer.

Explanation:

The goal of Aims to the benefits environment is to provide everyone information, values, and skills which are required to preserve and protect the environment.

Aims to benefit the environment includes

To decrease emissions and reduce pollution.

To improve waste management methods.

To reduce the consumption of natural sources.

To minimize noise and different nuisances.

3 0

3 years ago

Pls help me ASAP thank you!!

Stolb23 [73]

Sorry i cant even read that

7 0

3 years ago

The density of water is 1.00 g/mL. If your swimming pool holds 208,000 gallons of water, what is the weight of the water in a fi

Natasha2012 [34]

Answer:

12.455≈12.5 tons

Explanation:

1 US gallon of water (gal) = 8.35 pounds of water (lb wt.)

so we divide 208,000 by 8.35 to covert to pounds

then divide the pounds by 2000 to convert to tons.

8 0

3 years ago