UNIT 9 TEST REVIEW
1.) A
reaction between methane and sulfur produces carbon disulfide (CS2),
a liquid often used in the production of cellophane.
___ CH4 +
___ S8 à ___ CS2 + ___
H2S
If 1.50
moles of S8 are used, (A) how many moles of CS2 are
produced? (B) How many moles of H2S
are produced?
2.) Lead
(II) oxide is obtained by roasting galena, lead (II) sulfide, in air.
___ PbS
+ ___ O2 à
___ PbO
+ ___ SO2
(A)
Determine the theoretical yield (in grams) of PbO if
200.0 grams of PbS are
heated.
(B) What
is the percent yield if 170.0 grams of PbO are
obtained?
3.) Some
rockets are fueled by the reaction of hydrazine (N2H2)
and hydrogen peroxide (H2O2). How many moles of nitrogen gas can be
produced by reacting 255 grams of hydrazine with excess hydrogen peroxide?
___ N2H2 +
___ H2O2 à ___ N2 + ___
H2O
4.) One in
a series of reactions that inflate automobile air bags is the decomposition of
sodium azide (NaN3).
2 NaN3
à 2 Na
+ 3 N2
Determine
the mass of N2 produced if 100.0 grams of NaN3 are
decomposed.
5.)
Titanium is a transition metal used in many alloys because it is extremely
strong and lightweight. Titanium
tetrachloride (TiCl4) is extracted from titanium oxide using
chlorine and carbon.
TiO2 + C + 2 Cl2
à TiCl4 + CO2
If you begin with 1.25 moles of TiO2, what mass
of Cl2 gas is needed?
ANSWERS: 1.) (A) 3.00 moles CS2 (B) 6.00 moles H2S 2.) (A) 186.6 g PbO (B) 91.10 %
3.) 8.50 moles N2 4.) 64.60 g N2 5.) 178 g Cl2
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