We also wanted hours for the units of the answer

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Unformatted text preview: 1 day 24 h Using the first unit factor, we obtain 24 h ? h = 5 days × 1 day Now treating the units algebraically, the days "cancel": 24 h ? h = 5 days × 1 day and taking 5 × 24 h = 120 h, we obtain: ? h = 120 h With a little practice, the correct conversion factor can be chosen every time. In this case, we wanted the unit "days" to cancel; therefore, we put days in the denominator. We also wanted "hours" for the units of the answer; therefore, we put hours in the numerator of the conversion factor. Also, Writing "? h" first serves as a guide to remind us of what units we want in the result. Note that we might have picked the second of the two conversion factors. In this case we would have obtained: 1 day day2 ? hours = 5 days × = 0.208 24 h h The units in this answer are incorrect and tell us we have chosen the wrong conversion factor. The units serve as a good check of your answer. When several steps are necessary to carry out the conversion, a "roa...
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This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.

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