'Everyone of us is mortal, therefore it is obvious that some day the human race will disappear from the earth.' This argument commits which logical fallacy?

The argument moves from each single person being mortal to the whole human race perishing.

What holds of the members one by one is transferred to the collective as a whole.

But a property true of every individual need not be true of the group taken together.

Inferring from parts to whole in this way is the fallacy of composition.

So this argument commits the fallacy of composition.