Question

At 700 K acetaldehyde decomposes in the gas phase to methane and carbon monoxide. The reaction is:

Answer 1

Answer:

After 1.95x10⁴ s, total pressure is 0.34 atm

Explanation:

t(s) 0 1000 3000 7000

PTotal (atm) 0.15 0.16 0.18 0.20

These are the data of the experiment, so let's make a linear regression

       X    |    Y

       0    |  0.15

    1x10³ |  0.16

   3x10³ |  0.18

   7x10³ |  0.20

You can do this by the calculator, but let's do it manually.

Y = mx + b

m = (Y₂ - Y₁) / (X₂ - X₁)

m =  0.18 - 0.16 / 3x10³ - 1x10³

m = 0.02 / 2x10³ = 1x10⁻⁵

b = 0.15 (y-intercept, where x is 09

Y =  1x10⁻⁵ X + 0.15

Notice that in the statement, after 7000 s, pressure is 0.22 atm

1x10⁻⁵ . 1.95x10⁴ + 0.15 = 0.34atm