Determine the heat of reaction (δhrxn) for the reaction of calcium carbonate (caco3) with hcl to produce co2 by using heat of formation data:

caco3 (s) + 2 hcl (g) → cacl2 (s) + co2 (g) + h2o (g)

The heat of reaction (ΔHrxn) for the reaction is -164.9kJ

Explanation:

The given balanced chemical reaction is,

To calculate the enthalpy of reaction .

where,

Putting values in above equation, we get:

Therefore the heat of reaction (ΔHrxn) for the reaction is -164.9kJ

its weight is greatest on earth

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