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3 years ago

Which solution has the higher boiling point: 42.0 g c2h6o2 in 0.500 kg of h2o or 35.0 g nacl in 0.500 kg of h2o?

Chemistry

1 answer:

Lelechka [254]3 years ago

6 0

Answer:

The NaCl solution will have higher boiling point.

Explanation:

C2H6O2 is a molecular substance. Meaning that when it dissolves it will remain this way:

C2H6O2 ---------> C6H12O6 (aq)

Sodiumchloride (NaCl) is an ionic substance. Meaning that when it dissolves, it will create ions:

NaCl(s)-------> Na+(aq) + Cl- (aq)

Conclusion:

NaCl is an ionic compound and C2H6O2 is a molecular compound. Ionic compounds have higher boiling points than molecular compounds. Therefore, NaCl will have the higher boiling point.

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Which is the balanced equation for: Al2O3 + Fe – Fe3O4 + AL

Sloan [31]

Answer:

4Al203 + 9Fe -> 3Fe3O4 + 8Al

Amount of Al on reactant side: 8

Amount of Al on product side: 8

Amount of O on reactant side: 12

Amount of O on product side: 12

Amount of Fe on reactant side: 9

Amount of Fe on product side: 9

6 0

3 years ago

Calculate the change in the standard entropy of the system, delta s degree for the synthesis of ammonia from N_2(g) and H_2(g) a

Svet_ta [14]

Answer:

$\Delta S^{0}$ for the reaction is -198.762 J/K

Explanation:

$N_{2}(g)+3H_{2}(g)\rightarrow 2NH_{3}(g)$

Standard change in entropy for the system ( $\Delta S^{0}$ ) is given by-

$\Delta S^{0}=[2moles\times S^{0}(NH_{3})_{g}]-[1mole\times S^{0}(N_{2})_{g}]-[3\times S^{0}(H_{2})_{g}]$

where $S^{0}$ represents standard entropy.

Here $S^{0}(NH_{3})_{g}=192.45J/(K.mol)$ , $S^{0}(N_{2})_{g}=191.61J/(K.mol)$ and $S^{0}(H_{2})_{g}=130.684J/(K.mol)$

So, $\Delta S^{0}=[2\times 192.45]-[1\times 191.61]-[3\times 130.684]J/K=-198.762J/K$

3 0

3 years ago

Explain the significance of classify elements in the periodic table

Marta_Voda [28]

Answer:

Classification of elements in groups provide us with a fixed pattern in which the elements change their properties periodically.

Explanation:

3 0

3 years ago

As a result of the transfer of an electron from a less electronegative atom to a more electronegative atom,

Viktor [21]

Answer: The correct answer is Option d.

Explanation:

Electronegativity is defined as the tendency of an element to attract the shared pair of electron towards itself in a compound.

When electron is transferred from less electronegative atom to more electronegative atom.

The atom which is more electronegative gains electron and undergoes reduction reaction.

Reduction reaction is defined as the reaction in which an atom gains electrons. The oxidation number of the atom gets reduced during this reaction.

$X^{n+}+ne^-\rightarrow X$

During the transfer of electrons, energy is released when an electron looses is potential energy during the transfer.

Hence, the correct answer is Option d.

4 0

3 years ago

Iron-59 has a half-life of 44 days. a radioactive sample has an activity of 0.64 mbq. what is the activity of the sample after 8

myrzilka [38]

Radioactive decay is a pseudo-first order reaction. When you know the half-life of the material, you could use this equation.

A= A₀(1/2)^t/h
where
A is the final activity
A₀ is the initial activity
t is the time
h is the half-life

A = (0.64)(1/2)^88/44 = 0.16 mbq

6 0

4 years ago