Name:
Period:
Counting Atoms and Molar Mass (II)
Target L.2E= Calculate the molar mass of a compound
COUNTING ATOMS
SUBSCRIPTS only refer to the
atom that th,êv are BEHIND. For
example... /
COEFFICIENTS apply to the entire
compound, You MULTIPLY the
coeffi cients and SUBSCRIPTS.
2 H2S
HIS
There are TWO atoms of
HYÐROG,EN and only ONE atom
of SULFUR.
GOEFFICIENTS apply to the entire
compound. You MULTIPLY the
eoefficients and
B#QsCRlPTs.
ATOMS OF HYDROG,EN: 4
ATOMS OF SULFUR: 2
IF THERE ISN'T A SUBSCRIPT BEHIND AN
ELEMENï ASSUME THERE lS ONLY ONE ATOM OF
THAT ELEMENT!
lf elements or compound s are tns
ARENTHESES, then the SUBSCRIPT
nd the parentheses applies to
ing inside
2 H?s
ATOMS OF I.{YÐROGEN: 4
ATOMS OF
\7
BARIUM:
1
Tbiilis of dletribùti\€ prcpqty
ùgriù. but wittr ûultipliêr in
tl¡e bsck
ATOMS OF OXYGEN: 2
ATOMS OF SULFUR: 2
algebra:
Ba(oH),
/c\
ATOMS OF HYDROGEN: 2
Z(x+y):2x*2y
Directions: Fill in the data table with the correct data.
BASIC:
Consider the compound
Sodium chloride: NaCl
Mass of a
Atoms
single
atom
Total
Consider the compound
Sodium chloride: HzO
Mass of a
Atoms
Total
single
atom
Na
H
CI
o
Molar Mass
Molar Mass
Name:
Period:
Consider the compound
Carbon dioxide: COz
Mass of a
Atoms
single
Total
atom
Consider the compound
Silicon dioxide: S¡O2
Mass of a
Atoms
single
Total
atom
S¡
c
o
o
Molar Mass
Molar Mass
PROFICIENT:
Consider the compound
Consider the compound
magnesium gluconate:
iron ferrocyanide: Fez(CN)re
Mass of a
Atoms
Total
sinqle atom
Atoms
Fe
c
Mg
N
H
Molar Mass
2(MqCrzHzzOro)
Mass of a
sinqle atom
Total
c
o
Molar Mass
Consider the compound
Consider the compound
acetic acid: CH3COOH
Mass of a
Atoms
Total
slnqle atom
aluminum sulfate: 2Alz(SO+)¡
Mass of a
Atoms
Total
sinqle atom
c
AI
H
S
o
o
Molar Mass
Molar Mass
Period
Name:
DISTINGUISHED:
Consider the compound
Potassium h exa a n oferr ate(II):
3
Atoms
Mass of a
sinqle atom
Total
K
Fe
c
N
Molar Mass
How many molecules are in 10.5 grams?
Consider the compound
nol: 2
2cHoH
Mass of a
Atoms
Total
single atom
C
o
H
Molar Mass
How many molecules are in 10.5 grams?
Va
Name:
Period:
-)
Counting Atoms and Molar Mass (II)
Target L,2E: Calculate the molar mass of a compound
COUNTING ATOMS
SUB.SCRIPTS only refer to the
atom that thev are BEHIND. For
example...
/
COEFFICIENTS apply to the entire
compound. You MULTIPLY the
coefficients and SUB$CRIPTS.
2 HzS
Hfs
ATOMS OF HYDROCEN: 4
ere ars Tlwt atoms 0f
I{YDROGEN and rnly ONE atom
SULFUR.
GtEFFltlE,hlT$ ãpply to the entire
compound" Yor¡ MULTIPLY the
coefäcients and q U_BSCRIPTS.
Bñ,
ATOMS OF SULFUR: 2
IF THERE ISN'T A SUB$CRIPT BËI{IND AN
ELSMENï ASSUME TH,ERE tS ONLY ONE ATOM OF
EI.EMENT!
tf
sr rompounds are inside of
PARENTHESES, tl\en the Süts$CRIPT
ind the parenfheses applies to
ing inside.
2 HzS
*a{o"Ut
ï¡itrb
rgåiü,
ATOMS OF
ATOMS öF HYü¡ROGEN: 4
algebra: Z(x+y)
çith .mu¡fþlíd in
l¡e back
ATOMSOFOXYGEN: ?
ATOMS OF SUI.FUR: 2
lf-\
BARIUM: I
of d¡ùíÞùlí1æ pro¡Ety
hÍ
ATOMS OF HYDROGEN: 2
:2x * 2y
Directions: Fill in the data table with the correct data.
BASIC
I
Consider the compound
Sodium chloride: NaC!
Mass of a
Total
Atoms
single
atom
Na
CI
\
7b
z3
b5
3S
Molar Mass
fr ^l^ \
Consider the compound
Sodium chloride: HzO
Mass of a
Atoms
single
Total
atom
HZ
o\
\
lb
Molar Mass
7
It"
tØ ql*o\
Name:
Period:
Consider the compound
Móì
o
Consider the compound
¿ÐL
L
Mass of a
Atoms
Þlsi
OL
single
atom
Total
71
\¿"
Molar Mass
2g
Atoms
Wc\
OL
l(."
s
n
PROFICIENT:
Fe1
5Io
3qL
c
tt,
\L
7\ to
N
IB
\+
zçL
Molar Mass
E"o
o/*\
CL
\t"
Ht\
OL
Atoms
MgL
H
LIL\
cL+
oLl
\
\b
3b
O 2.\
ô 4 n/"0\
^/*o\
2('MqC :uH.zzOt+)
Mass of a
Total
single atom
2+
\
A8
qLl
IL
tb
288
4 r\8
I
ZY o l*o\
Consider the compound
alurninum sulfate: 2Alz(SO+)¡
Mass of a
Atoms
Total
sinqle atom
71
\oÒ
4
At
Molar Mass
a{
Consider the compound
magnesium gluconate:
7+
4
ÌL
\2,
\7.
Molar Mass
Consider the compound
acetic acid: CH¡COOH
Mass of a
Atoms
Total
single atom
Total
atom
Molar Mass
/*o\
Consider the compound
iron ferrocyanide: Fez(CN),re'
Mass of a
Atoms
, Total
single atom
Mass of a
single
SU
3t
\4¿
ì02
b*
Molar Mass
("
rwo
Name:
Period:
ADVANCED:
Consider the compound
Potassium hexa
noferrate (II):
Mass of a
Atoms
K\L
Feb
CW2
N
Total
single atom
bq
\?>
tg
¿\
5,1.
\bô
\L
7\ t-
Irt
Lsz
Molar Mass
I
It ô4 0
How many molecules are in 10.5 grams?
Ò
/o,s
I
3
ltt
0
t to¿J
I
6,lsl /D't
w,D\r,
6,0z y lAzs n"n\crn, Ls
/r"l
3
Consider the compound
ro nol: 2 CHs CHOH
Mass of a
Atoms
Total
sinqle atom
c?c
OL
H
q6
tL
\b
3z
tø
\(/
\
\rlL\ ofr".\
Molar Mass
How many molecules are in 10.5 grams?
to.5
\
3
7t
6,b? Y tCI *o\e¿r.le
,ynÒ \
rqü
4.n t /D jz mt/¿,
q
J
w10
\
Name
Period
Add the following integers:- pay close attention to the signs!
1.5+(-3)=_
3. (-B)+B=s. (-9) + (-1) =
_
2. L2 + (-14) =
4.9+(-1)=_-
6.-12-(-2)=I
)