Question

6. For a chemical reaction, x+2y-z, If the rate of appearance of z is 0.50 moles
per litre per hour, then the rate of disappearance of y ls
a) 0.5 moles per litre per hour
b) 1.0 moles per lite per hour
c) 0.25 moles per litre per hour
d) Can't be predicted​

Answer 1

Given:

Chemical reaction: x + 2y → z

Rate of appearance of z, d[z]/dt = 0.5 mole/Lhr

To Find:

The rate of disappearance of y.

Calculation:

- The rate of reaction can be written as:

Rate = -d[x]/dt = -d[y]/2dt = d[z]/dt

⇒ -d[y]/2dt = d[z]/dt

⇒ -d[y]/2dt = 0.5

⇒ -d[y]/dt = 0.5 × 2

⇒ -d[y]/dt = 1 mole/Lhr

This is the rate of disappearance of y.

- So, the correct answer is option (b) 1.0 moles per litre per hour.