Determine the theoretical yield of H2S (in moles) if 64 mol Al2S3 and 64 mol H2O are reacted according to the following balanced reaction. A possibly
useful molar mass is Al2S3 = 150.17 g/mol.
Al 2S3(s) +6 H 2001) - 2 Al(OH)3(s) + 3 H2S()

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

i believe the answer is three water molecules