2.5 Balanced equations and related calculations
a) Mgtzltcl( →) Mgclz
M
+
H
cm )
(s)
(
g)
Mg :|
Mg :|
11--1×2=2
01=2
61--1×2=2
b) una
11=2
t
→
Oz
Cs )
2Naz0
(g)
CS )
Na
Na :/ ✗ h=4
-
-
2×2=4
0--1×2=2
0=2
c)
,
( a Colt )
,
car ]
1- ZHNO
}
Car)
→
Ca (Noz
)z
Cag)
1-21-120
( t)
1)
Cag,t2Hz0,→caGH)ztH ,
Caq)
\
Cail
(g)
Ca= )
1-1=2×2--4
0=2
0=1--2
1-1=21-2
2)IVANO
→
}
ZNGNO
Caq )
Na
-
t
Oz
caq ,
1×2=2
-
z
(9)
Na
\
-
1=2
N= 1×2=2
N= 1=2
0=3×2--6
0--2×2=4
3)
2mg
CNO
,
)z
→
s
(g)
mg
N
2Mg0(
tYNoz
)
-1=2
Mg
-
Cu
G)
All
oz
(g)
Correct
(g)
-1×2=2
-
W -1×4=4
-2×7=4
-
-
0--5+8=13
0=6×2--12
4)
+
+211,50h
→
Curson
1-
So
( aq)
[ aq)
,
(g)
\
Cut
H= 2×2--4
1-21-1,0
(1)
Cu
-
-
l
5=2
5=1×2--2
0--7×1=8
0=4×2--8
17=2×2--4
5) HI
1-
( s)
→
3oz
(g)
2A\z°3cs)
)
A- 1--1×4=4
A- 1--2×2=4
0=2×3--6
0--3×2=6
6) f- e
1-
( s)
Fe
(
-_
342cg
I
1--2×3=-6
→
Fed
,
>
( s)
Fe -1×2=2
-
c.
1=3×2--6
equations
Ionic
step
1
Pb (No ]) zcaq
)
step
2-
.
Rewrite the
g,y
step
3
stay
:
with state symbols
bat and equation
the
write
:
t
2H
equation
Clean
with
all
Identify all spectator
Pbclz ( s )
→
ions
ions
+
ZH No
,
cag ,
( must include state symbols )
separated
( ions that
are
not
µ,
un
undergoing
a
chemical
reaction
uncharged )
,
guy ,
,
,,
on , ,
;
.gg,
,,
,,
,,
a
gun , ,
ma , , , .
¥+54052ci-pbc.it#tzNY5spbttzci-pbcP
+
+
I
1-
Mg Cl
Mg
=
A g=
1-
2A
can]
g
No
→
,
gag ,
I
=
,
1- 2A
get
Cs
1
Mg
✗ 2=2
N
:
=
I
2
0: 6
0=3×2--6
C)
Mg op
Cant
I ✗ 2=2
-
N
,
2
Ag
=
1×2
D= 1×2--2
Mlg
"
t
Agt 1- N§j
mgfi.no/jt2Agdzcit2Agt-2Agc1
2C it 2
→
)
uoltcaoyt AYSON
2-
<
→ Alcott )
,
,t3Na,So
(s )
Caq)
Nat
can )
A- 1=1
/⑧
0=13
It :L
0=7
It
CHEM
s :3
:3
Na=2
.
5=1
At -1
-
6M¢
,
+
Oli
+
AP;+sF→2AlC②H }
?
6015th
→
ZAICOH )
,
+
Hatt #