Ow many coulombs of charge are needed to produce 35.2 mol of solid zinc?

6.79 × 10⁶ c

Explanation:

Zn can be produced from the electrolysis of an aqueous solution of a Zn salt. The reduction reaction is:

Zn²⁺(aq) + 2 e⁻ → Zn(s)

We can establish the following relations.

The charge needed to produce 35.2 mol of Zn is:

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