How many liters of H2O gas are produced when 7.25 liters of C3H8 are
burned at STP?

C3H8 + 5O2 → 3CO2 + 4H2O

(pls show work)

explanation:

0.07 g/cm³

1.37 g/cm³

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