Question

A zero order reaction turns from 100g to20g in 42s determine the half life
plz help now​

Answer 1

Answer:

26.25s

Explanation:

Given that in 42s 100g of substance turns into 20g.

To find the half-life of a reaction,  we need to find the time consumed in which the substance turns to half of its initial weight, starting from any weight.

In our case, we have started the timer, when the substance was 100g.

So we need to find the time for conversion of this substance from 100g to 50g, i.e half of 100g.

From the question 100g-20g = 80g of subsatnce is deformed in 42s.

So 1g is deformed in 42/80 = 0.525g

We need to find the time for deformation of 50g.

Therfore the required time is 0.525*50 = 26.25s.