0.50g of calcium carbonate. The chemical equation for the neutralization of hydrochloric acid with calcium carbonate is: CaCO3(s) + 2HCl(aq) -> CO2(g) + H20(l) + CaCl2(aq). What mass of hydrochloric acid will this mass of calcium carbonate neutralize?

it is a good conductor

explanation:

that's what i got you can count the number of atoms

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