"What additional info is required to solve this problem" type questions

[salemstein]

1A(g) + 2B(g) --> 1C(s) + 1D(g)
Given weight of A consumed, what else do I need to know to calculate molecular weight of D? These questions tend to destroy me. You guys have a good way to tackled them?

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[aldol16]

Write out the relevant equations. (g A)/(g/mol A)*(mol B/mol A)*(g B/mol B)/(g B)

 

[NextStepTutor_2]

1A(g) + 2B(g) --> 1C(s) + 1D(g)
Given weight of A consumed, what else do I need to know to calculate molecular weight of D? These questions tend to destroy me. You guys have a good way to tackled them?

Hi @salemstein ! Whenever the MCAT asks you to make calculations, conceptual (like here) or literal, you want to do a quick inventory of the variables or units you have, and the units you want. This will allow you to better understand what relationships there are, and will be of use, even when you cannot recall the exact equation you need. By examining the units of what you have vs what you want, you can connect the dots. See which piece of information they present is necessary for you to arrive at the desired variable.



Hope this helps, good luck!