2 Um acidente fez com que 500 litros de ácido sulfúrico de concentração 10 mol/l vazassem de um caminhão-tanque e começassem a atingir um lago. Para mini-
mizar os efeitos ambientais, todo o ácido teve de ser neutralizado o mais rápido
possível com carbonato de cálcio. Qual a massa mínima de sal necessária para
esse procedimento, isto é, a neutralização completa do ácido?
(Massa molar: Caco3 = 100 g/mol.]​

i wish i could but this one is weird give me abc and i can solve it.

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