km 827 m our road map is m k m the relationship is

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: oes it have the correct units? _______________________________________________________________________________ EXAMPLE 1.11 Conversions with SI Prefixes Express the following amounts using prefixes from the SI. a. Convert 827 m to kilometers. b. Convert 257 mg to micrograms. •Method of Solution for (a) Conversions within the SI are based on knowing the SI prefixes. First state the problem in the format: desired quantity = given quantity × conversion factors. ? km = 827 m Our road map is: m → k m The relationship is 103 m = 1 km, which leads to two possible conversion factors: 103 m 1 km 1 km 103 m Choose the one that allows cancellation of the unit m. and ? km = 827 m × 1 km 103 m ? km = 0.827 km •Method of Solution for (b) First state the problem: ? µm = 275 mg Back Forward Main Menu TOC Study Guide TOC Textbook Website MHHE Website Chemistry: The Study of Change / 1 7 Since we know how many mg are in a gram and how many µg are in a gram, we will convert mg to grams and then grams to µg. Road map: mg → g → µ m ? µm = 275 mg × 10–3 g mg × 1 µg = 275 × 10 3 µg 10–6 g ? µ...
View Full Document

This note was uploaded on 09/15/2009 for the course CHEM 102 taught by Professor Bastos during the Spring '08 term at Adelphi.

Ask a homework question - tutors are online