Unformatted text preview: e 1 6 / Chemistry: The Study of Change
Then we multiply by the third conversion factor so that the centimeter units cancel and the meter units remain:
? m = 100.00 yd × 3 6 in
2 .540 cm
1 cm Carrying out the indicated operations yields:
? m = 91.44 m
The key to problem solving by the factor-label method lies in knowing where to find and how to use
Outline of Problem Solving Steps in the Factor-Label Method
1. Identify the known (given) and unknown quantities.
2. Restate the question and identify principles and mathematical relationships appropriate to the situation.
desired quantity = given quantity × conversion factors
3. Plan a solution (road map). Decide what steps are needed to solve the problem.
4. Setup the calculation by inserting the conversion factors. For each arrow in the road map, one conversion
factor is needed.
5. Calculate the answer and cancel units. Always include the units of the answer (desired quantity).
6. Check the solution by doing the calculation again. Ask: Is the magnitude of the answer reasonable and d...
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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.
- Spring '08