18g of water is takento prepare the tea. Find out the internal energy of vaporisation at `100^(@)`C. `(Delta_(vap)H` for water at 373 K 373 K is `40.66kJ mol^(-1))`
A. `37.56kJmol^(-1)`
B. `-37.56kJmol^(-1)`
C. `43.76kJmol^(-1)`
D. `3-43.76kJmol^(-1)`