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Unformatted text preview: to hours in order to answer the question.
Insert one conversion factor per arrow in the road map.
1 .61 km
? h = 2.75 × 10 9 m i ×
3.00 × 1 0 8 m
= 4.099537 h × 1 m in
60 s × 1h
60 min Following the rules for significant figures, we must round off this answer to three significant figures. Therefore
? h = 4.10 h
EXAMPLE 1.13 Using Density
What is the mass in grams of a lead (Pb) brick that measures 21.5 cm × 9.7 cm × 62 mm? The density of Pb is
11.4 g/cm3 .
•Method of Solution
Density is defined by the formula:
V Back Forward Main Menu TOC Study Guide TOC Textbook Website MHHE Website 1 8 / Chemistry: The Study of Change
If you know any two of the variables in the equation, you can solve for the remaining unknown.
First rearrange the equation to solve for mass.
The density is given but you still need the volume of the brick. For...
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- Spring '08