General approach

A scheme summarizing the three step approach to solving problems in this module is shown below. Using this scheme either mass or concentration and volume of a known substance can be related to mass or concentration or volume of an unknown substance if the two substances are involved in a reaction for which the balanced equation is known.
 
Step 1: 
Calculate the amount in moles of the known substance using

n = c × V
n = m/M

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Step 2:
Relate calculated n(known) to  n(unknown) using any pair from

For aA + bB → cC + dD

n(A)	=	n(B)	=	n(C)	=	n(D)
a		b		c		d

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Step 2:
From n(unknown) calculate the desired quantity using

c = n/V