Which of the following statements about the combustion of glucose with oxygen to form water and carbon dioxide (c6h12o6 + 6 o2 → 6 co2 + 6 h2o) is correct?

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

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.