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SCH3A Grade 11 Chemistry
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1. How many particles are there in one mole? 6. 02- X 10z1 Par4icter
2. It is estimated that a sample of matter contains 1.38 X 1025 atoms. How many moles are present in the
sample? ,nol = 1.38 X l0 ZrafomS X )mot- = 11.9b"91
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3. Ilow many moles of barium are present in a sample having a mass of 22.3 grams? rtto^ = 21.3 q X 1 v►eo^ ^l ^^q = 0.(b3
4. A chemical reaction requires 3.7 moles of boron. What mass, in grams, of boron must be used in the reaction?
I=
3.7molX
Il
I
imol=
41
5. A sample of naturally occurring carbon has a mass of 1. 732 grams. Calculate the number of moles of carbon
in this sample.
mot = 1.'T 3 z $ x I wt
f t
0I 1121
= 0. 1c,{c/3 mot
6. A chemical reaction results in 57.2 grams of the gas carbon dioxide, CO2. How many molecules of gas were
produced? ,no(ectlei = S-7.
X 6.0LX 1023 m0 leC- X (uto
o
zg
83 x 1
ttitol
&. --j
ilnot
0I
7. Calculate the mass of one trillion molecules of oxygen, 02.
t
rno(tculej
10 t' wtOleC X t 0 ( X 3 ^C^ _ ^X 1 D^11
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8. Calculate the number of moles in:
a) 25gramsofoxygen,02 MD( _ ;15^^X (Wto//i'tq . 0•^8n^o/
b) 0.27 g of ammonia, NH3 itt,ol= 0.2:T g X I14io1l7g = 1, & y /0 - 2nt.o1
O,9bh. 1
c) 10.5gofsodium, Na Mol= 104'g X. lmot
d) 347 g of ammonium nitrate, NH4NO3 on oI 3 4 1- X 1 *110 I /8 a = ^, 3 X01
IM.DI
9. Calculate the mass, in grams, of:
a) 1.24 moles of water, H,O 9 = I.3-0µo I /c III / l 01 = 22 .3
wto 1 . /y. 3
b) 0.269 moles of amonium chloride, NH4C1
0, ^- 6 9 w+ol k C l
13
c) 5.62 moles of sodium hydroxide, NaOH = 3• w-u"o1 X q61 /we 1 =
d) 2.35 moles of sodium sulphate, Na2SO4
1 .3 SM-o 1 x 1 q L ^/mo 1 = 33q 2
10. Calculate the number of molecules in:
a) 3.00 moles of chlorine, Cl2
Malec
1.00 w.o1 x NA /w o(= I. U X IV
Ate Ice
u
01 ->
b) 3.00 moles of uranium hexafluoride, OF
t^
3.ao uvtol x ^/F ^la, of = I• (X/0^ yuUiCC
6 VA o
c) 3.00 moles of hydrogen chloride gas, HCI indlfC = 1.00 Wt01 X WA J
i- I. $1x/DZy
d) 3.00 moles of any kind of molecule ,"Otte
tuo^e C .
_ .00 roof X NA J rx ol = 1.81,C/oZN tuOtte
11. Calculate the number of atoms in:
a) 3.00 moles of chlorine, Cl2
let 1<
tfan.f
^su e t^e.= 3.t;zX /OZya
"'A'02' yuo
P
10 f -^ f.Iu. b) 3.00 moles of uranium hexafluoride, UF6 ut01M t = 1. g l x to Zy motet X
atv P^ltitclec . /.Z^X 10^sa}owti
c) 3.00 moles of hydrogen chloride gas, HCI cdomP = I.81XIO% tolee x -1U0►a1S/y^0(lG3 •`LxlaZ a
d) 3.00 moles of ammonium sulphate, (NH4)2SO4 A,+&VAf =
X/
p2V
l• I
NtD IeC X 1Sd10rt1oI ec = 1.'1 X10
Retu n. to the Noi
littp:,'/www.ucdsb. on.ca/tiss/stretton/chemi/Molesex4 .htm
3/22/00
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SCH3A1 Grade 11 Chemistry
1. Calculate the mass of
a) 2.00 moles of water, H2O
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!.o a ►,+• f X ((1 rm e 1 = 3 G
b) 4.38 moles of chlorine, C12 1 = q. 31 a+el x foo/rwo l z .31 q
c) 0.025 moles of ammonia, NH3 j = 0 .0 2-S w►o l) r^ lm o l = d o. qj j
d) 1.8 moles of oxygen, 0 2
^xI/r►tiDl
= 3"8c^
--'^1naI
2. Calculate the number of moles in
a) 25gofhelium,He Mol = 25^ X Iw,ol/'Ia (1.2.
b) 12.Sgofmethane, CH4wLol= 1,5-1 x i oijIt wOI
c) 0.364gofiodine, I2 mot=0.36LEjx 1me l/2fHI = (.41X
10
d) 40.Ogofsodium,Na Wt ('D.oq X f^wol/234
^ rADl
mot
zy
3. Calculate the number of particles in t'
a) 2.50 moles ofNeonNe a r1 ckS= 2.SOM61x kA /l^n.ol =
I.51XID
parh'ck^
b)010.050 LA
moles of iron, Fe para;cter = o .osD
►uo 1 X A/A /tw.01
= 1.0 X ID L2 pqr-( der
4. Calculate the number of moles in
a) 9.03 X 1023 atoms of Cu No).:. 9.03 X 16 2la,fowV1'
( -^ m01
X 1 *11// NA
f SO *to t
b) 3.76X 1025 molecules ofSO2 wtol
• 3 •j6a(10 1' o(eCX
i n sI /I1, 6 1.q r4o)
c) 8.6 X 1018 electrons M)/ .z $• 6X /D'$ e- X 1 ^+9I
IUA . I^^)( 10- xm ol
5. Calculate the number of molecules in
'!
a) 12.5 g of nitrogen, N2 0014C = It
•S 4 X 1! A /*toI X i nto// 2.
2.69 X IV '3 me (cc,
b) 0.76 g of ammonia, NH3 I%tokC = 0.7Jdd
q X NA /cool x 11n 0
g
x'
c) 0.60gofhydrogen,H2
(t It
*to l ee = 0 .1o fX Nk/ 1, l X 4tol / 9 = (. $X1
42IyholeC
L1
3q
4
6. Calculate the mass of
Q
a) 4.25 X 1024 atoms of C I = `(•
LS X1o 2yafa*tr Y. 0%11 /lfA X t 2. 9 /Ik 0
1,}q
b) 6.02 X 1021 molecules of H2O
A = 6.0.. Xl b ' ('wtoLe(, x M o l / Np
X
l d ^ l ytt o l = 0. l' 0 q
c) one trillion atoms ofZn C^ =
I X i 012el.-fewr X Mti o 1 / f(A X b S U /m e 1 =
()( 1D - 10 q
d) one atom of U
Y
_
At
I a} 0 w%. x ( VW% U 1
$
-=1
p A. j.3 o
f rr<0 1 _"1
X IP
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3/22/00