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Furkat [3]
4 years ago
12

Which statement about enthalpy is true?

Chemistry
2 answers:
gogolik [260]4 years ago
5 0

Answer : Option C) Enthalpy is a state function because its change depends only on initial and final conditions.

Explanation : Enthalpy can be defined as a thermodynamic quantity which is equivalent to the total heat content of a system. It is equal to the internal energy of the system(U) plus the product of pressure and volume (PV).

E = U + PV ;

It is a state function as it only depends on the initial and final conditions, and not on the path taken to reach these reaction conditions.

Therefore, the integral of state functions can be taken using only two values: the final and initial values.

IrinaVladis [17]4 years ago
4 0
<span>Enthalpy is a state function because its change depends only on initial and final conditions.</span>
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Acid + alkali > salt + water
the acid and alkali neutralise each other 
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Convert 48 000 cg to g
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what are the similarities and differences between distillation, azeotropic distillation, extractive distillation and liquid-liqu
DedPeter [7]

Explanation:

- Simple Distillation: its a separation method that can be used when the two or more liquids in the mix have at least 50 degrees of difference between their boiling points.

-Azeotropic distillation: is a technique to break an azeotrope (constant boiling point mixtures), that can't be separated by simple distillation, by adding another component to generate a new azeotrope (between one initial component and the new one added) with lower boiling point.

-Extractive distillation: is a process to separate mixtures with close boiling points by adding a miscible, high boiling or none volatile solvent to increase the relative volatility of the liquids in the mix, this increases the separation factor. It differences from the azeotropic method because it doesn't form an azeotrope.

-Liquid-liquid extraction: is a method to separate compounds based on their relative solubilities in two different immiscible liquids.

After describing all the methods we can conclude that all of them are methods to separate substances based on their physical properties, this is their similarity. The difference between this method is the property it uses to separate (solubility in the case of extraction and boiling point in the case of destinations), the cases in which they bare used (when the liquids difference in boiling points is bigger [simple] or close [attractive and azeotropic]) and the formation of azeotropes (present in azeotropic and absent in extractive).

I hope you find this information useful and interesting! Good luck!

6 0
3 years ago
Be sure to answer all parts. Liquid nitrogen trichloride is heated in a 3.00−L closed reaction vessel until it decomposes comple
iris [78.8K]

Answer:

p_{Cl_2}=629.25mmHg\\p_{N_2}=209.75mmHg

Explanation:

Hello,

At first, consider the chemical reaction:

2NCl_3-->3Cl_2+N_2

Now, considering the ideal gas equation, we compute the total moles:

PV=nRT\\n=\frac{PV}{RT} \\n=\frac{839mmHg*\frac{1atm}{760mmHg}*3L }{0.082\frac{atm*L}{mol*K}*359K }\\ n=0.1125mol

Then, taking into account that the total moles are stoichiometrically handed out by the half (0.05625mol), one can say that:

n_{Cl_2}=0.05625molNCl_3*\frac{3mol Cl_2}{2molNCl_3} =0.084375molCl_2\\n_{N_2}=0.05625molNCl_3*\frac{1mol N_2}{2molNCl_3} =0.028125molN_2

Thus, the molar fractions are:

x_{Cl_2}=\frac{0.084375}{0.1125} =0.75\\x_{N_2}=\frac{0.028125}{0.1125} =0.25

Finally, the partial pressures are:

p_{Cl_2}=x_{Cl_2}P=0.75*839mmHg=629.25mmHg\\p_{N_2}=x_{N_2}P=0.25*839mmHg=209.75mmHg

Best regards.

8 0
3 years ago
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