The equation shown represents cellular respiration.

Glucose + Z → X + Y + Energy

What do X and Z most likely represent?

Group of answer choices

A X represents water and Z represents oxygen.

B X represents carbon dioxide and Z represents sugar.

C X represents sunlight and Z represents hydrogen gas.

D X represents hydrogen and Z represents carbon dioxide.

Option A. X represents water and Z represents oxygen.

Explanation:

Glucose + Z → X + Y + Energy

The equation above gives an illustration of the Combustion of glucose to produce energy needed for metabolic activities.

Thus, writing a balanced equation will help us to identify what X and Z most likely represent. This is illustrated below :

C6H12O6 + 6O2 —> 6H2O + 6CO2 + Energy

We can see clearly that Z is constant i.e Z is oxygen. But X could be either CO2 or H2O.

Considering the options given above, only option A states that Z is oxygen. Therefore, X must be water (H2O).

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