Which method is used to make the salt copper(II) sulfate?
A. dilute acid + alkali
B. dilute acid + carbonate
C. dilute acid + metal
D. dilute acid + non-metal oxide

Its B. Dilute acid + carbonate

Explanation:

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a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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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