Select the correct answer. The symbols IA, IB, and i represent blood types A, B, and O respectively, where I stands for dominant and i stands for recessive. Which Punnett square represents the cross between a woman with both A and B antigens and a man that has neither A nor B antigens?
A.
IA IB
i IAi IBi
i IAi IBi
B.
IA IB
i iAI IBi
i IAi IBi
C.
IA IA
IB IAIB IAIB
IB IAIB IAIB
D.
IB i
IA IAIB IAi
i IBi ii
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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