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3 years ago

How many grams of NaCl can be produced from 4.2 moles of Cl2?

Chemistry

1 answer:

Vikentia [17]3 years ago

6 0

Answer:

491.4 g

Explanation:

This a stoichiometry question, let me repeat the reaction equation here;

2 Na + Cl2 --> 2 NaCl

The balanced reaction equation must serve as a guide in solving any problem on stoichiometry.

From the balanced reaction equation;

1 mole of chlorine gas yields 2 moles of sodium chloride

Therefore, 4.2 moles of chlorine gas yields 4.2 ×2/1 = 8.4 moles of sodium chloride.

Molar mass of sodium chloride= 23 + 35.5= 58.5 gmol-1

Mass of sodium chloride formed= number of moles × molar mass

Mass of sodium chloride formed= 8.4 × 58.5= 491.4 g

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An endergonic reaction with a Δh and Δs can be changed into an exergonic reaction.

zheka24 [161]

Full question:

This question is incomplete, here it is completed:

An endergonic reaction with a ______ ∆H and a ______ ∆S can be changed into an exergonic reaction by decreasing the temperature.

Option A: negative, positive

Option B: negative, negative

Option C: positive, positive

Option D: positive, negative

Answer:

Option B: negative, negative

Explanation:

The change in free energy (ΔG) of a system for a constant-temperature process is

ΔG = ΔH - TΔS

free energy is the energy available to do work. Thus, if a particular reaction is accompanied by a release of usable energy (that is, ΔG is negative), it is said to be exergonic. On the other hand, if a reaction consumes energy (that is, ΔG is positive), it is said to be endergonic.

Looking at the equation, we can see that if ΔH is negative and ΔS is negative, then ΔG will be negative only when TΔS is smaller in magnitude than ΔH. This condition is met when T is small.

ΔG = ΔH - TΔS

- -

This means that the reaction proceeds spontaneously at low temperatures. At high temperatures, the reverse reaction becomes spontaneous. An example of that would be the following reaction:

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3 years ago

After 11.5 days, 12.5% of a sample of radon-222 that originally weighed 42g remains. What is the half-life of this isotope?

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