We’re being asked to** calculate the standard entropy change** for the following reaction at 25 °C.:

MgCl_{2}_{(s) }+ H_{2}O_{(l)} → MgO_{(s)} + 2HCl_{(g)}

We can use the following equation to solve for **ΔS˚ _{rxn}**:

$\overline{){\mathbf{\Delta S}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{S}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{prod}}{\mathbf{-}}{\mathbf{S}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{react}}}$

Calculate the standard entropy change for the following reaction at 25 °C.

MgCl_{2}(s)+H_{2}O(l) → MgO(s)+2HCl(g).

ΔS rxn = ?

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What scientific concept do you need to know in order to solve this problem?

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