Calcute The equilibrium constant expression is If K_c at a certain temperature i

Question

Calcute The equilibrium constant expression is If K_c at a certain temperature is 2.9. and at a higher temperature K_c is 0.18. Which of the following produces the strongest conjugate acid? On a relative basis, the stronger the intermolecular forces between species in a solution: If the density of the liquid is greater than the dentils of the solid form of a substance, this indicates that From the following list of aqueous solutions and water, select the one with the highest boiling point. Magnesium (used in the manufacture of light alloys) reacts with iron (III) chloride to form magnesium chloride and iron A mixture of 41.0 g of magnesium (MM -24.31 gmol)and 175 g of iron(III) chloride (MM = 162.2 g mol) is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

Explanation / Answer

For question 8, I need the overall reaction so I can tell you what's the correct answer for that.

Question 9, the correct answer is c) because P and T are relationed, and if at higher temperature Kc is lower, means that the reaction is favored to the reactants. So, if you decrease the pressure, the Kc will rise again and therefore, the forward reaction.

10. The strongest conjugate acid you may say that by looking the pKb of the substance. the lower the pKb, the strongest the base, and therefore a weak conjugate base. So according to this explanation, the aniline with a pKb of 9.79 has the higher pKb which means that the conjugate acid is also strong, because the base is weaker than the others.

For question 11 and 12 I have doubts between two options, so I will not answer these until I'm sure.

Question 13. Usually, saline aqueous solutions has boiling points higher than water, but in this case the sucrose will have the higher boiling point, because, is a carbonated compound and has a larger atoms of C, so the more atoms of carbon, means that the boiling point is higher, therefore will have the higher boiling point among the others.

Question 14. First calculate the moles of each reactant:

moles Mg = 41 / 24.31 = 1.69 moles

moles of FeCl2 = 175 / 162.2 = 1.08 moles

3 mole of Mg -----> 2 moles of FeCl3

1.69 ----------> x

x = 1.69 *¨2 / 3 = 1.13 moles of FeCl3 needed.

And we have 1.08 moles, this means that the FeCl3 is the limitant reagent, now let's see the mass of the excess remaining.

moles of Mg remaining = 1.69 - 1.62 = 0.07 moles

mass remaining = 0.07 * 24.31 = 1.70 g of Mg

Option E

Hope this helps.

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