The enthalpies of all elements in their standard states are:
(i) unity

(ii) zero

(iii) < 0

(iv) different for each element

Question

The enthalpies of all elements in their standard states are: (i) unity (ii) zero (iii) < 0 (iv) different for each element

Philoid · Accepted Answer

By definition, the enthalpy of formation of elements in their standard state is taken as zero. Therefore, The enthalpies of all elements in their standard states is zero irrespective of the element.

Thus, right answer is (ii) zero

The enthalpies of all elements in their standard states are:(i) unity(ii) zero(iii) < 0(iv) different for each element

The enthalpies of all elements in their standard states are:
(i) unity

(ii) zero

(iii) < 0

(iv) different for each element