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ZanzabumX [31]
3 years ago
7

A reaction that is spontaneous can be described as

Chemistry
1 answer:
sveticcg [70]3 years ago
7 0

Answer:

(A) proceeding without external influence once it has begun.

Explanation:

<em>A reaction that is spontaneous can be described as</em>

<em>(A) proceeding without external influence once it has begun.</em> TRUE. A spontaneous reaction has a tendency to proceed in the way it has begun. It is spontaneous when Gibbs free energy is negative.

<em>(B) releasing heat to the surroundings.</em> FALSE. If the reaction is exothermic (enthalpy negative), one still has to take into account the effect of the entropy on Gibbs free energy.

<em>(C) proceeding in both the forward and reverse directions.</em> FALSE. This just means that the reaction is reversible.

<em>(D) increasing in disorder.</em> FALSE. This means that entropy increases but it is still necessary to take into account the effect of enthalpy on Gibbs free energy.

<em>(E) having the same rate in both the forward and reverse directions.</em> FALSE. This is related to the kinetics but not the spontaneity.

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When 0.49 g of a molecular compound was dissolved in 20.00 g of cyclohexane, the freezing point of the solution was lowered by 3
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Explanation:

Depression in freezing point:

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where,

\Delta T_f = depression in freezing point  = 3.9^oC

k_f = freezing point constant  = 20.8^0C/m

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M_2 = molar mass of solute = ?

Now put all the given values in the above formula, we get:

(3.9)^oC=1\times (20.8^oC/m)\times \frac{(0.49g)\times 1000}{M_2\times (20.00g)}

M_2=131g/mol

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