Asealed 1.0 l flask is charged with 0.500 mol of i2 and 0.500 mol of br2. an equilibrium reaction ensues: i2 (g) br2 (g) 2ibr (g) when the container contents achieve equilibrium, the flask contains 0.84 mol of ibr. the value of keq is

The value of Keq = 110

Let's know how to get it :

According to the equilibrium reaction equation :

I2(g) + Br2(g) → 2IBr(g)

now we need to get the value of Keq

when the Keq expression is:

Keq = [IBr]^2/ [I] [Br]

when we have [IBr] at equilibrium = 0.84 so we need to get [I] &[Br] at equilibrium .

when [Br2] = [I2] = 0.5 - 0.84 / 2

= 0.08 M

so, by substitution

∴ Keq = (0.84)^2/(0.08)^2

= 110

The equilibrium constant (Keq) for the reaction I₂(g) + Br₂(g) ⇄ 2IBr(g) when 0.500 mol of I₂ reacts with 0.500 mol of Br₂ in a 1.0 L flask is 110.2.  

The reaction is the following:

I₂(g) + Br₂(g) ⇄ 2IBr(g)

The initial concentrations of I₂ and Br₂ are:

At equilibrium we have:

I₂(g)  +  Br₂(g) ⇄ 2IBr(g)

(0.5-x)  (0.5-x)      2x

The equilibrium constant of the above reaction is:

We know that the flask contains 0.84 mol of IBr at equilibrium, so:

Now, knowing that x = 0.42 mol/L, we have:

Therefore, the value of Keq is 110.2.

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a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

the answer would be a