Now that we understand the mole concept and mol-mol conversion factors, we're ready to do quantitative calculations. Consider the rusting of oxygen: Method I:
Method 2: Steps 1-3 above can be accomplished in one overall calculation by treating the problem like a dimensional analysis problem: The second method is somewhat easier since it can be accomplished in one line. Let us do one more example: Consider the combustion of butane: If we need to recover 150 g of water, what mass of butane is necessary? The method 2 result is: Most chemical calculations involving masses are carried out in a similar manner. |