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Equilibrium Constant Calculations

Authored by Abdul Supandi

Chemistry

University

Used 1+ times

Equilibrium Constant Calculations
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24 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A vessel was filled with NOCl gas until the concentration was 0.398 mol/liter. The temperature of the system was increased to 245 oC and the system was allowed to undergo the reaction, 2NOCl(g) --> 2NO(g) + Cl2(g), until equilibrium was attained. The physical chemistry students did a calculation and found the [Cl2] at that point was 0.0225 mol/liter. Calculate the value of Kc at that temperature.

2.87 x 10-3

3.66 x 10-4

8.13 x 10-3

1.29 x 10-4

9.14 x 10-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Sampel SO3 dimasukan ke dalam reaktor kosong dan vakum, kemudian dipanaskan hingga 600 K. Kesetimbangan berikut terjadi: 2 SO3(g) --> 2SO2(g) + O2(g). Jika tekanan total sistem adalah 3.0 atm dan fraksi mol O2 adalah 0.12, tentukan nilai Kp ….

0.15

0.05

2.5 x 10-2

1 x 10-4

3.5 x 10-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Perhatikan reaksi dan tetapan kesetimbangannya: N2O4(g) --> 2NO2(g)Kc=5.85×10−3 suatu campuran reaksi mengandung [NO2]=0.0255M dan [N2O4]=0.0331M. Tentukan Qc dan ke arah mana reaksi berlangsung.

Pembentukan NO2

Penguraian N2O4

Ke arah pereaks

Tidak berubah

Ke arah produk

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Untuk perubahan fasa Br2(ℓ) --> 2Br2(g), ΔH∘=+31.0 kJ.mol−1 dan ΔS∘=92.9 J.mol−1.K−1. Dengan asumsi ΔH dan ΔS hampir tidak bergantung pada temperatur, tentukan temperatur dimana terjadi kesetimbangan antara Br2(ℓ) dan Br2(g) pada 1 atm (titik didih normal Br2)

273 K

298 K

334 K

375 K

450 K

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A study of the system, H2(g) + I2(g) --> 2HI(g), was carried out. Kc = 54.9 at 699.0K for this reaction. A system was charged with 2.50 moles of H2(g) and 2.50 moles I2(g) in a 5.00 liter vessel as the only components initially. The system was brought up to 699.0 K and allowed to attain equilibrium. How many moles of H2(g) should there be in the container at that time?

0.531 moles

0.674 moles

0.594 moles

1.00 moles

0.266 moles

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The thermochemical equation representing one process used for the synthesis of ammonia involves the equilibrium shown, N2(g) + 3 H2(g) --> 2 NH3(g) For this reaction, H° = 92.2 kJ, G° = 33.4 kJ. All things considered, one concludes that

the coefficients give us the mole ratios but not the volume ratios of the reacting species.

an increase in pressure favors an increase in the yield of ammonia.

carrying out the reaction at a higher temperature shifts the position of equilibrium to the right, thus favoring an increase in the yield of ammonia.

cooling the mixture to remove ammonia from the reaction mixture unfortunately also decreases the overall yield of ammonia.

the mixture does not need heating, in fact, cooling the mixture assists the rapid establishment of equilibrium.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Determine the equilibrium constant Kp at 25°C for the reaction: N2(g) + 3H2(g) --> 2NH3(g) (G°f (NH3(g)) = -16.6 kJ/mol)

1.52 x 10-6

2.60

8.28 x 10-2

13.4

6.60 x 10^5

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