How is enthalpy related to the spontaneity of a reaction? O A. AH = 0 c
ontributes to spontaneity.
B. AH<0 contributes to spontaneity.
O C. AH does not affect spontaneity.
O D. AH> 0 contributes to spontaneity.

hi,

the answer is d, it has indefinite shape but definite volume.

hope this !

a

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