This explanation is for this equation
oxygen can be removed from metal oxides in chemical reactions. for example:

copper oxide + carbon → copper + carbon dioxide

2cuo(s) + c(s) → 2cu(l) + co2(g)

in this reaction, carbon is oxidised because it gains oxygen. at the same time, copper oxide is reduced because oxygen is removed from it.

so write the explanation for the displacement reaction for zinc+ iron sulphate= zinc sulphate+iron

have a great day because if you dont you and i will be sad

2b2t

explanation:

2b2t

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

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