Question

If only I knew then that the disease was curable, said the vet to the farmer

Answer 1

He meant that at time the disease was not known and there was no cure discovered for it by than. So he failed to save them. and showing his sorrow and sadness over the lost as now he is able to cure that disease. 

Answer 2

Explanation:

20% surface sites have adsorbed n2. On heating n2 gas evolved from sites and were collected at 0.001 atm and 298 k in a container or volume is 2.46 cm3. Density of surface sites is 6.023 Ã 1014/cm2 and surface area is 1000 cm2, find out the no. Of surface sites occupied per molecule of n2.