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How do we calculate delta n for a given equation? Is it number of moles of the products minus the number of moles of the reactants or the opposite? and do we include solid and liquid products and reactants or just gasses? and what if delta n is 0?
The focus should be on the change in moles of gaseous particles, as this is will sometimes be the cause of the change in volume (which will help you solve for work). As for whether it's Ps-Rs or vice versa, it's more or less focusing on the change in the number of moles due to how the initial and final state of the system differs.
It is also important to note that limiting reactants may still apply to a problem. For example in question 101, you have to determine the limiting reactant and then the amount of moles in excess. You would also the have to add the moles of excess to the moles of product you calculated using the balanced equation.
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