The dynamic critical radius of nuclei in homogeneous nucleation () can be defined as . Consider an ice crystal nucleus of 1.23 nm radius. The melting temperature of water is 273 K, the surface tension between ice and water is 10-19J/nm2 and the enthalpy of melting is 4*10-19 J/nm3. How much undercooling (in Kelvin) is required so that water can solidify via homogeneous nucleation

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol