10.27.3 Can you answer these questions?

10.27.3.1 Fix first (two) questions with McExam package

https://tex.stackexchange.com/landing/r/digest?cta=question&id=715709

I am writing an McExam with the McExam package with multiple versions. The first two questions are supposed to read 
\documentclass{article} 
\usepackage{mcexam} 
\begin{document} 
\begin{mcquestions} 
\... 
[mcexam]
 

asked by abq254 https://tex.stackexchange.com/landing/r/digest?cta=user&id=318583 Score of 1

10.27.3.2 How should I have diagnosed this? Figuring out when to insert code into hooks to alter third party package behaviour

https://tex.stackexchange.com/landing/r/digest?cta=question&id=715678

This question seems very confused to me, so I'm not sure you will be able to make sense of it. 
I know how to solve this problem (now). What I would like to know is how I should have diagnosed and ... 
[latex3] [package-writing] [documentclass-writing] [hooks] [lthooks]
 

asked by cfr https://tex.stackexchange.com/landing/r/digest?cta=user&id=39222 Score of 1

10.27.3.3 Position of ion charges

https://tex.stackexchange.com/landing/r/digest?cta=question&id=715449

I want to write the equilibrium equation of ethanoic acid in water using the chemmacro package. 
By wanting to add the phases, I do not obtain the expected result. 
With 
\documentclass{article} 
\... 
[chemmacros]
 

asked by Nicolas https://tex.stackexchange.com/landing/r/digest?cta=user&id=231550 Score of 1

answered by MS-SPO https://tex.stackexchange.com/landing/r/digest?cta=user&id=245790 Score of 0