CH 101 notes 8-24

# CH 101 notes 8-24 - Mass to Moles to Mass A Ca(NO3)2 sample...

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Mass to Moles to Mass A Ca(NO 3 ) 2 sample contains 2.04 grams of nitrogen. How much does the Ca(NO 3 ) 2 sample weigh? Mass to Moles to Mass – Section A.8 2.04 g N x ? = _____ g Ca(NO 3 ) 2 grams N ! moles N ! moles Ca(NO 3 ) 2 ! grams Ca(NO 3 ) 2 (ratio) (ratio) (ratio) Correct # of parts Xsometh ings 1 something = Y Parts Value given Ratio in Formula (true statement = 1) Value asked for x Ratios of “1” for Ca(NO 3 ) 2 1 mol Ca 1 mol Ca(NO 3 ) 2 2 mol N 1 mol Ca(NO 3 ) 2 6 mol O 1 mol Ca(NO 3 ) 2 1 mol Ca 2 mol N 1 mol Ca 6 mol O 2 mol N 6 mol O 164.086 g Ca(NO 3 ) 2 1 mol Ca(NO 3 ) 2 Ratios from Chemical Formula: Ca(NO 3 ) 2 Ratios from Periodic Table 40.078 g Ca 1 mol Ca 14.007 g N 1 mol N 15.999 g O 1 mol O Mass to Moles to Mass Mass to Moles to Mass – Section A.8 A Ca(NO 3 ) 2 sample contains 2.04 grams of nitrogen. How much does the Ca(NO 3 ) 2 sample weigh? Mass to Moles to Mass Mass to Moles to Mass – Section A.8 grams N ! moles N ! moles Ca(NO 3 ) 2 ! grams Ca(NO 3 ) 2 (ratio) (ratio) (ratio) 2.04 g N 1 mol N 14.007 g N * 1 mol Ca(NO 3 ) 2 2 mol N * 164.086 g Ca(NO 3 ) 2 1 mol Ca(NO 3 ) 2 * = 11.9 g Ca(NO 3 ) 2 grams O ! moles O ! moles N ! grams N (ratio) (ratio) (ratio) A Ca(NO 3 ) 2 sample contains 14.03 grams of oxygen. How many grams of N does it contain? Mass to Moles to Mass Mass to Moles to Mass – Section D.3 Ratios also work with reaction coefficients: 4Fe(s) + 3Cl 2 (g) ! 2Fe 2 Cl 3 (s) How many grams of Fe are needed to react with 75.0 grams of chlorine gas (Cl 2 )?

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## This note was uploaded on 06/08/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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CH 101 notes 8-24 - Mass to Moles to Mass A Ca(NO3)2 sample...

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