12. NAD and NADPH are distinguished from each other by the that's bonded to the sugar ring attached to the adenine.
O A. phosphate group
O B. adenine
O C. carbon dioxide
O D. nicotinamide

a I think I dont know probably

A. phosphate group

Explanation:

I got it right in class!

Hope this Helps!! :))

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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