Calculate the mass of butane needed to produce 72.9 grams of carbon dioxide

Explanation:

The balanced equation is the following:

The molecular mass of the carbon dioxide is:

Atomic mass of C = 12

Atomic mass of O = 16

Molecular mass of = 12 + (16*2) = 44

The molecular mass of the butano is:

Atomic mass of C = 12

Atomic mass of H = 1

Molecular mass of = (4*12) + (10*1) = 58

Find the grams of carbon dioxide using the stoichiometry of the reaction:

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