1. What is the mass of 7.50 moles of sulfur 17. What is the percentage c0II!.~~~" dioxide (S02)? TlfW dinitrogen tetroxide (N20J? (8 = 32.1 g/mol; 0 = 16.0 g/mol) ~ (N = 14.0 g/mol; 0 = 16.0g/mol) 70""/00 2. What is the mass of 0.438 mole of ammo- . What is the percentage composition of a 43 010 G nium chloride (NILCI)? ~ carbon-oxygen compound, given that a 95.2-g 0 (N = 14.0 g/mol; H = 1.Qg/mol~5 g/mol) sample of the compound contains 40.8 g of carbon ~7 /1 0 r3) How many moles are there in 250.0 g of and 54.4 g of oxygen? sodi~ phosphate (Na;?04)? . 19. What is the percentage composition of " (Na = 23.0 g/mol; P = 311~Ql; \ . suIfur-chlorine compound, given that a 30.~ Jl ~/4 ..5 .0.::;: 16;O.g/mol) .. ,·U5j>-tfV\i)\e sampleofthec~~poundisf~undtocontain9.93 ,.q.<lj. 1/" .", ..' -'~'. 4. How many 'rnoies are th~re in 993. g of . of sulfur and -21.;5 g of chlorine? ' '.- lY. ~ l : .c-:,:.: -potassiurrt.sulfate (KiS04)? 5./0 I me Ie: . 20.' Asample ora compoundthat has-a mass :_ : . (K = 39.1 glmol; S = 32:1 g/mo; = 16.0 g/mol) 'of 0.432 g is analyzed. The sample is found to be' 70 ~ F ==-s. How many atoms . 3.00 moles made up of oxygen and fluorine only. Given that b of sodium (Na)? 1.1.1 'f.. m;!~oll>vy)~ the samplecontainsO.128 g of oxygen, calculate 30%0 6 H · th· 1638 x the percen e com osition of the com ound. e ow rnanyoms are ere ill . 10- 9 mole of lithium (Li)? 1-q.<6101 'f-.. 10 14 a\-vm ') \ 2 Find the empirical formula of a com- L _ pound, given that the compound is found to be )-----.1 7. H.ow many ~olecules are there m 4.55 47.9% zinc (Zn) and 52.1% chlorine (CI) by mass. Zn tI;bJ '" moles of rntrogen (N 2 ). l? ,74 1-- ~()'4' V'(\o\q:,!!:,ks 1 (Zn = 65.4 g/mol; CI = 35.5 g/mol) '. ~ • ~ How many atoms of rntro en (N are 22 Find th - . al 4' ula f '---. th ~218 1 f - (N-\?~ ;L _.L.I • e empmc rorm 0 a com- ere m. mo es 0 rntrogen 2J. ."'1 'f-.jl) i1jpNll; IVa.l d· th t 48 5 I fth d~ .- .poun ,gIven aa . -g samp e 0 e compoun' f3 9. How many atoms are there m 0.663 molt: is found to contain L75 g of carbon (C) and 46.75 g t t'-f of water (H20)? ·1 \. 2.Cl 1- (010\- iHo)'y\..S J of bromine. (Br). . 10. How many moles are there in 15.5 x (C~- 2.0 g/mol; Br = 79.9 g/mol) 1()23molecules of carbon dioxide (C02)? I ;/",'57 me I] 23 What is the empirical formula of a com- 11. How many moles are there in .32 x -1l. d, given that a 212.1-g sample of the com-rc;tn} i. -,.._.......,1;.;.0_ 12 ~lecules of carbon tetrachloride (CCI 4 ) ~.?b'~'fVJ\tpound contains 42.4 g .of hydrogen (II) and 169.7 g~ ;>" . W What is the volume occupi~ of carbon (C)? What 15 the molecular formula of 420 moles of oxygen gas (0 2 ) at STP? \""qrr.1 dlY\~ the compound, given that it has a gram molecular L. mass of 30.0 g/mol? 13. What volume does 0.0147 mole of rn (H == 101 gl l: C = 120 gl. I) gen dioxide gas (N0 2 ) occupy at STP? .3Z.Qclm· 3 .' mo, . mo 14 H . I there i 45 0 dm3 f . 24. A compound is known to have a gram . ow many mo es are ere m. 0 I ul f 391 5 I L Find th . . al methane as (C~) measured at STP?~ mo ec ar mass 0 . g mo e empmc ~ g . . ~3 . and the molecular formulas of the compound, B I 15. How many moles are there m 0.335 dm given the results of an analysis of a 310.8-g sample 3 ==;;;;;;;o;;;;f::;;r~gon gas (Ar) at STP? lIso i fO-:Z moll that reveals that the sample contains only boron - 16. Calculate the percentage composition of . (B) and iodine (1). The mass of the iodine in the lithium oxide (Li20). L-t16 o )0 Li sample is found to be 3022 g. (Li = 6.94 g/mol; 0 = 16.0 g/mol) ,54: ~/D 0 (B = 10.8 g/mol; I = 126.9 g/rnol) .o (oTn.po:::,H; 0 () - 1 To t:hd -errtPif-t 'ccu tor-mu.la., N\(1)~k&"'1=;- To\-J ,P&r~ W1~) = % Cr;fYI,p. t~{ cltmtJlt1 t. t;e;i- Moles .... I ~ut L~\ v r dt. Ail ~1'1(} \e:) plJ j'ma./lt5t- /)10 e A!:'.~:: 3. tC: YCju,~b abovt C\1)<*- whole VltttYIhtf5, y()Jfi p~ h'j .., . J.. 3 ecl- 10 mili -then; ~vh()r I t..{il't ~ -k flJ \lY\o\e'eu.J4 v .{OrtVtu.l&..,", I /, .OA-Nutj ~~~5 5 . \70 tiliOJe.. :5>~51 AtJD up ~mAs'S of CfI'Lpr n CA./-- .. 8-8 CHEMISTRY:The Study of Matter COPYRIGHT by Prentice Hall. Inc. ~'i ~ <t" rom fik-Y"l 1+ q.o 1M\ewav h7.tL '>5. r.ax;,'cl~ . Reproduction of this master is restricted to duplication 'for classroom use only. ,/ ~()'/'l.> , ~me -'-- Date Class _ CHAPTER 8 Text Reference: Section 8-10 Practice Problems -~ (