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4 years ago

Which equations represent precipitation reactions?

Chemistry

1 answer:

viktelen [127]4 years ago

3 0

In a precipitation reaction, one of the product formed is an insoluble precipitate.

The given reactions can be written with phases included as:

A. $Na_{2}S(aq)+FeBr_{2}(aq)-->2NaBr(aq)+FeS(s)$ : In this reaction one of the product, FeS is insoluble. Therefore, this is a precipitation reaction.

B. $MgSO_{4}(aq)+CaCl_{2}(aq)-->MgCl_{2}(aq)+CaSO_{4}(s)$ : In this reaction, the product $CaSO_{4}$ is a solid(insoluble). So, this is a precipitation reaction too.

C. $LiOH(aq)+NH_{4}I(aq)-->LiI(aq)+NH_{4}OH(aq)$ : In this reaction, both the products are soluble. So this is not a precipitation reaction.

D. $2NaCl(aq)+K_{2}S(aq)-->Na_{2}S(aq)+2KCl(aq)$ : In this reaction, both the products are soluble. So this is not a precipitation reaction.

E. $AgNO_{3}(aq)+NaCl(aq)-->AgCl(s)+NaNO_{3}(aq)$ : In this reaction, the product AgCl is a precipitate. So, it is a precipitation reaction.

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2 years ago

15.0 moles of gas are in a 8.00 L tank at 22.3 ∘C∘C . Calculate the difference in pressure between methane and an ideal gas unde

leva [86]

Answer:

$\Delta P=4.10atm$

Explanation:

Hello!

In this case, since the ideal gas equation is used under the assumption of no interaction between molecules and perfectly sphere-shaped molecules but the van der Waals equation actually includes those effects, we can compute each pressure as shown below, considering the temperature in kelvins (22.3+273.15=295.45K):

$P^{ideal}=\frac{nRT}{V}=\frac{15.0mol*0.08206\frac{atm*L}{mol*K}*295.45K}{8.00L}=45.5atm$

Next, since the VdW equation requires the molar volume, we proceed as shown below:

$v=\frac{8.00L}{15.0mol}=0.533\frac{L}{mol}$

Now, we use its definition:

$P^{VdW}=\frac{RT}{v-b} -\frac{a}{v^2}$

Thus, by plugging in we obtain:

$P^{VdW}=\frac{0.08206\frac{atm*L}{mol*K}*295.45K}{0.533mol/L-0.0430L/mol} -\frac{2.300L^2*atm/mol^2}{(0.533L/mol)^2}\\\\P^{VdW}=49.44atm-8.09atm\\\\P^{VdW}=41.4atm$

Thus, the pressure difference is:

$\Delta P=45.5atm-41.4atm\\\\\Delta P=4.10atm$

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