On another planet, the isotopes of titanium have the given natural abundances, Abundance
Isotope
46 Ti
48 Ti
79.200%
14.300%
6.500%
Mass (u)
45.95263
47.94795
49.94479
50 Ti
What is the average atomic mass of titanium on that planet?
average atomic mass =

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