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Worksheet 7-3 . Name.
Percetit Composition & Empirical Formulas — Period_
Glencoe Chemistry pp.328-337
Show your work to receive credit, Circle your final answer,
A. Calculate the percent composition for the following compounds.
1. CnOs
[> Se Z oO ———
Ge iets os O83 % cn] a 4%4 .{ sXS|
[SQ Seis Is Om < .
3 Ded i IS 2 2 GgOa Cry O 2
one pe
2. CaxPOx)2
Ca 180.045 oe & Ol. Ha O [aR 4%
Bis i) Ble Mea Caf los) Cazleos)
BION gla _ Ble lis Casta Bie 1S oy Co >
2 lapse ~ 14, APD OM Ca lOuyat = [Abe 3% OW
[BESCT OE ps et Ch Galea} a ok
B. Calculate the per "percent By mass Of ion in each of the following compounds. t a}
3. iron CID) oxide Fes On ae . :
Hl Be Fe Poa og Fa hy Fa th Pesos,
IBA. F oy Foy
4. iron (oxide Fee .
68.89 Fe = | 3 pee . Few FeO |
= “ pat ees :
ALIS s FeO
C. Determine the empirical formula for each compound.
5. A compound contains 0.0130 mol carbon, 0.0390 mol hydrogen, and 0.6065 mol
oxygen. Gere melo 9 6, 6. oe rt °
COGS melo * at °|
@, Gees nal
3. ODAe cnet
6. A compound consists of 72.2% magnesium and 27.8% nitrogen by mass.
BWR mel My 5 =>
fmot Mel FR. A
= S55. * epee = LS Xo =
24, Dis thy) 249% ma oT
) re} | OFFS a lob et Hy 2 | ka OF 23 al
THe tg ho 5 be eo [el
7. ‘Glucose contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.
Het 6 | toes o Bp] © | SRPO 3 artemis Te
WDC | Bee =
Tinet WE OS ba, 2¢ 7 . a
Het HL GAH 2 OG BRE mt noo
Lets b. Baee = fel. Cia}
8. Phosphoric acid is found in some soft drinks, A sample of phosphoric acid contains
0.3086 g of hydrogen, 3.161 g of phosphorus, and 6.531 2 of oxygen.
teat Hf eB Hl 6. 39sSt mH.
fat at 6. beast noeereesenenee
font PLB? 2 8. lepee mel Pj Ho Pox |
~ j 4
jogo
impel @ [ 6. BbI5° 6 4agig TO 4
Ie a ee, Bee
