Two chemicals A and B are combined to form a chemical C. The rate, or velocity,

Question

Two chemicals A and B are combined to form a chemical C. The rate, or velocity, of the reaction is proportional to the product of the instantaneous amounts of A and B not converted to chemical C. Initially, there are 40 grams of A and 50 grams of B, and for each gram of B, 2 grams of A is used. It is observed that 10 grams of C is formed in 6 minutes. How much is formed in 12 minutes? What is the limiting amount of C after a long time? How much of chemicals A and 8 remains after a long time? A grams B grams

Explanation / Answer

Total amount of A = 40 grams

Total amount of B = 50 grams

Ratio of chemical reaction A:B = 2:1

So, for 40 grams of A only 20 grams of B is utilised

Total amount of product = (40+20) grams = 60 grams

In every 6 mins, 10 grams is formed
So, remaining product to form 50 grams

Therefore in 12 mins, it will form 2*10 =20 grams

Limiting amount of C after a long time will be total product that can be formed i.e 40+20 = 60 grams

Remaining A will be 0 (zero) grams, as it is fully utilised.
Remaining B will be 50-20 = 30 grams

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