Limiting and Excess Reagents
1. For the following three reactions, identify the reagent that is in excess, and by how much it is in
excess.
a) 50 mL of L.25 mol/L HClraqr is reacted with 75 mL of 1.00 mol/L KoHraqr
Hc t (^1,) +
Kou+
i
V: O'O5o \-
LcLl)
+
Ke\ [a1) -t
= C " OT5 L
C: \ . (lo rrro \ /c
h: O.O-l E tAo\
14
z
o.,
,
r,l
\.Zf rn'c\ /1f\: O. ObTsrno\ ,
Ca
LR
[\p:
O.O-75
rno\
---
D. Ob3 rrol
KS
b) 5.00 g of magnesium solid reacted with 7.00 g of hydrochloric acid.
M3cs> + Jt{Ct ((tc,\
( cL"L)
Hacl
:5,oC3
rn:-7.@1
1.,\= A.Bl 3/rwot t,\= 3b.qb$lwrot
fYl
\LR
c) 100 mL of 0.50 mol/L HClr.ql reacts with 50 mL of 1.00 mol/L KOHraq)
+
Hc\ (,.p
!:
c:
h:
O.
\ooL
Ko\{ ( o1,)
*>
KClro
lv= e.e)soL
O. Scnrrol/t
\,,
\\r: : O.il rnot
+H6
Y-): O.O 5O bnol
2. When 7.OO g of copper solid is immersed into 400 mL of 0.650 mol/L silver nitrate solution, the
following reaction occurs. What mass of silver is produced?
Cu151
fY\=?.OO3
f.{
: bz.55r
+
2AgNOs(aq)
V:
O.
Cu(NOg)z(aq)
*
2Agtrl
m=?
LlooL
c: o"6boT3
l.'1
:
tO"?
wro I
fl:
O. \\ o rno\
ab= O.\tox 3.
:
O.'Z.ZOwn\
LR
\1 =
:
XS
!T\E
^?
O. 2to rno
. t1 gt mo
Y\: O.27Opno I
O.Zb rrrr \
no3: $'2b
)
thal r ecrch
nu. = O. tlZffiot ,r: o.olbn*r
l
flXt= O.
C: [.OOrrno\le
O.O5ocno\
ca1
n u1
n = O. \qZ rnc'l
x .l-: o.2clbmo\ np : O.tQZ wlolx!= 0.otbrnol
i
Xi
M3 Ctr
R,
f\= O. ZO6 rnot
nR : O..Zob
+
)
Y^\
t'\
7a.1
I
,4
"._J
I
3. lf 25 mL of 0.55 mol/L phosphoric acid is reacted with 100 mL of 0.010 mol/L NaOHlaqy, what is the
maximum mass of water that can be formed?
' > No, Poq LLv +3Ho14,,
t4a PO u\ Cor) +sNaOH (a*r)
!: O.\OO L
!: O,O25 L
C= O. 55 rnol / e
f : O. o\orno\ /U
n: O.cr3'l5vnoi Y1 : o. oo \ nno\
nu'o
nn=?
M= \B,0za
lvtol
fl:
fl 11zo: b'oo\ rno\ r2^
3
=:::ilLf,
:
i-
XS
O.c:c;\ rnol
LR
t't"\:
-.
4. what mass of potassium chloride will form if 1s0 mL of 5.00 moUL
n il
I Yl1 = 0,O\83
W6:ly:rts
with 7.50 g of
Wfl(rq)?
KOH
arc &) YancLnv\
lhivgi \^{ ro^3 w iH^ h{^(s
Th eY€
qr-*shcn It\^n no{*
$oi^J tu 'even
f3,^3
JD
frK
bo+V1 evr?,
,t
5. lf 32.5 mL of hydrogen gas at SATP reacts with 0.0200 g of oxygen gas, what mass of water will
form?
2 [-\a(g) + OacS) '-> e \{^ ccr)
V: O.C)325 L
{:2q.8 Yrot
tt1
fiWz'=
=
:- D' OO\3\rnot
D'C->Ol3\ x
O
C>O\bt
XS
+
rno\
:
Ort: 7
\{= tB
o.o2oo 3
tvt = 37.c(:$ lrryr"\
fY1
Y\
:-
O.
OOOlozf rno
fl ttzo= O'ccObZS *+
: O. OO\25rno\
LR
\
O. OOI rnc )
.02!
3l hoo
r
6. When 10.0 L of nitrogen gas at 105 kPa and 35"C are mixed with 33.5 L of H21gy at 95.0 kPa and
40"C, they form ammonia gas. What mass of ammonia is formed under these conditions?
t3 \{a(b) -+l
N 2c5)
V
L
V =V2.5
I p:
gs.or(P"..
= tO.Q\-
P=
\ob
:
3ta -\sk
n=PV
,# : I,ZZZ wro)
Pv
h: Hq'
o.qOqB
RTe =
O.t{CRt
.= Q=Biq-1.mo\ X:
much zinc Fu+ffdA was produced?
pho:9h'c[r'
'
+
rY\= \\. 8 3
{-\ =
= b5 q\g/rnol
D. ltD
\
rnol
z
Tnlgz: O'\tOl-\x 6
\
uclf L1,.8 g of Znts) ?nd
fi1
= 13 q 9_
) \n"=r\
4.g3'ffi
3
Pq
s €d,
how
'-7
2 7 ^rB cs)
c:)
?
ff)= q"q 3J
fYl =
H= \8,88 3lrn.,t
14: ZSU ,11 3 lrno(
fi:O"O3qlql rnol (^t
fizr,.h.
O.
V-l
O3qt K2
= o.579
= O. oQlc:\ rno\
LR
8.
I
P\15)
b 7Y1 (s)
l'4
hno
\\ - = n. M
: O, g t.{.1 ryro t
phosohorous were
\
reacted.
7. Solid zinc and solid phosphorous
.o{Slwro\
t
\
f\NH3=\,n2 Y ?
3
x3t
\1
q
f> n: O.t trl
Rt
wro\
N*3:
H:
T : qo"c
: 3o8.\s
=?
fY'\
i
uP'n
f= 38"c
K
Y'1
N [\3c3)
xs
s
= c)- obo\
u\no
I
\
l I trt: n.['l
rY1",
thermite reaction, solid aluminum and iron (lll) oxide are combined to form iron and
aluminum oxide. How much aluminum oxide can be produced from 299 g of aluminum and 958
In the
Fe2O31sl?
7n\(s) + ruilC,3(s) *-->
rn=zqq 5
b^ =
l\.ot
. OB nno\
x
j2
=
:- t 56
5 5.-\
rWol
LR.
: 5,q11 -r.'\
flF": b.W r L
I
: ,5,q q1 rrnc I
XS
| 2o3c>)
\,\ = lot .1 {o ) f rn"l
+n:5,5\nncl
fn: n.H
5tor3
of
{-Ztrecs)
fn =?
I
Zb.qt9/*o M = l$q .-l j l"n" I
n:\\
ntre=
Y-Y'r
R
g