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dmitriy555 [2]
3 years ago
11

After wood burns, the ash weighs much less than the original wood. Explain why the law of conservation of mass is not violated i

n this situation?

Chemistry
1 answer:
svlad2 [7]3 years ago
4 0

Explanation:

The law of conservation of mass and energy according to thermodynamics is NOT violated. The ash of the wood weighs less than the initial wood because during the burning some of the mass was converted to gases that escaped into the atmosphere. Some of the carbon in the wood, for example, turned to carbon dioxide. Water in the wood also turned to gas (water vapour) and escaped.

If it is possible to capture all these gases and weigh them, then ideally it would be observable that the law of conservation is NOT violated.

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Calculate the concentrations of all species present in a 0.26 M solution of ethylammonium chloride (C2H5NH3Cl).
Alina [70]

Answer:

0.00000223

Explanation:

pKa for C2H5NH3+ = 10.7

pKw = 14.0

pKa + pKb = pKw

10.7 + pKb = 14.0

pKb = 14.0 - 10.7

pKb = 3.30

C2H5NH3Cl is a salt of ethylamine and HCl so it will dissolve in water to produce  C2H5NH3^+ + Cl^-

The base hydrolysis reaction:  C2H5NH3^+(aq) + H2O(l) <=> C2H5NH2(aq) + H3O^+(aq)

This reaction is described by Kb.

Kb = [C2H5NH2][H3O^+]/[C2H5NH3^+]

Let [C2H5NH2] = [H3O^+] = x,

so [C2H5NH3^+] = 0.26 - x

Kb = x^2/(0.26 - x) = 2.00 x 10^-11  

Let's solve for x. In this equation,  It is possible to solve without the use quadratic equation. So we can assume that 0.26 - x  is approximately equal to 0.26.  We won't know until we do the calculation.

We get:  x^2 + 2.00 x 10^-11x - 4.99 x 10^-12 = 0

With the use of a quadratic calculator.

x = 2.23 x 10^-6 M = [C2H5NH2] = [H3O^+]

0.26 - x  is just 0.26 M in this problem because 2.23 x 10^-6 M is insignificant.

[C2H5NH3^+] = 0.26 M = [Cl^-]

NOTE:

pH = -log [H3O^+] = -log(2.23 x 10^-6) = 5.65

Ka is the acid dissociation constant

Kb is the base dissociation constant

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3 years ago
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EleoNora [17]

Answer: b

Explanation:

7 0
3 years ago
11.
andrew11 [14]
B. Groups (families)
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What is the outcome of hotspots? Question 13 options: Formation of islands Constant volcanic eruptions Divergent boundary intera
miss Akunina [59]

Answer:

Constant volcanic eruptions Hope this helps!

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2 years ago
The heating curve shows the energy gain of a substance as it changes from solid to gas. Which section of the graph shows the liq
Schach [20]

Answer:

C. C

Explanation:

The heating curve is a graphical representation shows that how different phases of substances change as it is influenced by the increase in temperature or heat.

Section A represents solid phase, Section B represents solid-liquid phase, section C represents liquid phase, section D represent liquid-gas phase and section E represents gas phase.

Section C of the graph shows the liquid phase of the substance gaining kinetic energy. During Phase C, heat energy is absorbed and liquid particles gain kinetic energy to change into gas form that is section E.

Hence, the correct option is C.C.

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