ttluLTtsrEPtfioLEcoNyERsfoNs
r
Name:
Score:
Block:
/52
,.
Rememberto include units and coruectnumberof sigfi3s.
1. How many atomsare contained in I molecule of eachof the followin g: (4 marks)
l^[jd, @,^[*, .iff.'fu
o&^s'
v ""- r '
---J
lrc,
c. - crsHzzoeNzs
tSrfin^,s
r r - ' \a
d. (cH3)2cb^tt
d.r.=[*lc,*4o'=
: lxl. .lofu,m
r*n*=
I rrtc : 46 oJ"ns citot lr".lc, l)drr-. -2. Find the mass,in grams,of eachof the following: (4 marlcs)
a. 125 He atoms
rrvDr)=
l2,5A,n\:t*!= . .
4.0 g
y,
hot*trcloiur'. tl'-t
Lnatc-
b. 2.45mL of Ozre STP
@
21
3txto wn22rfSxL.! . l!-1. .32.0q lq, ot t &LG =
'
c. 5 x 1OtoN, molecules
d. I Ag atom
I'.la=5xb1ti#h6 l. 33xn!
#,
3. How may atoms are contained
to1.?Ll.t1xn-$
Itw.fd-., Jn-l
offiti
Ltnol
in eachof the followin g: (4 marlrs)
lh- !! tt#;;:il'4d. .
u*^=
3".rJ
tntc
lwt
IO a*rrt :
b. 2.5 mol of O3sr;
.Sxlozlin^ ntn=lfSr.,l,6W-t.
lnt, |
c. 15L of Ars @ STP
'
d. 6.5x 10-ug of Kr
Ah' 15L.ln,l. ,Lola.l9!b*.
.hgt 6.or,xu;tJ
4,oxlole,, cl.nn,6.Sxto'h
- I.qxlot6,A
.t O, a- ^
L t.+L -1rrtel
I
Q-.-J
83.7, r.ri
lt.v
4. What volume at STP is occupiedby eachof the followine? G marks)
a. 16.5g of AsH369
[rr*l . a) AL
v0[=l6.Sa.
-J
?.1.q3TilT-,',
b. 0.745g of Osra
[n'l c2'4L
ucrt,0.?45.
3'4q-'ffi= 0.349L
cY 8.65r i02lmoleculesof SOzrg)
vot'$.5Sxto'lrlc
.. [n-|
6ffia^tiffi
a
o,32L L
22.qL
d. 3.25kg-of CzHera
uol
'3tso'f;$,ry
)4Zo L
5. whatisthedensity
of co261atSTP?(2marlrs)&
D=4et.o9
,c+L
L'.C+L
-
r,o'9L
,F
I f""
ASSI*L
I
l,q6xl/)-t o/r^L
I n" L
6. The densityof CCla1lis 1.59 glmL. How many moleculesof CCl4 arethere in
2.50L of CCI+?(2 marlrs)
g+ . WV=
p.tc,
2*fu*we*L,-'],59.;.
l s 4 ,o 3 tr v l
1.55^11'rerJ
ly,^ -
7. What volume of C6H619
contains8.50 x l02aatomsof C? (densityof C6H661:
0.877 g/ml) (2 marks)
vol.B,so'"ro2{oil^c.
W HUW
ffi=Ff
8. Whatis the molarvolumeof quartz,SiO2?(density: 2.64g/mL) (2 martcs)
tnol/^L
c).cv+31
ho\anr,rr[=1,541. .
9.
ov' t
6o.[q
L
n^L
,
What is tliomolS.r
re molar volume
L€of Au? (ensity
[q'3[ 3
rnotan
uo[: -r
L
: 19.31g/ml) (2 marks)
| ,
!n'o
-L
t't'1
tlql,c)
'u5
t r^L
--l
O,pqgoLhol/uL
10. What volume is occupiedby 0.0875rndl of Ag? (density: 10.5g/ml,) (2 marks)
r' 1,J,t=L
vo\= 0'0845n'.,rt
' lo+''l
To
9 ,>S
,q
tl P
mof
\ct I
\
O,8q1r'^L
11. How manyatomsaretherein 2 moleculesof Hg(IOfrt fZ marl<s)
L
4 ' I
h\l
tflrrns: ",(
q"^rt^
c , --
-
I yntc,
tg o*m"s
12. What volume at STP is occupiedby 43.5g of ClF31',"t
lrnroI
=
+3-s
uof
JJ qI.Sr1
W.>r\
A
'
-#.,'
22.4L
-, :
(
trr\oIt
tlrno
lcl.sL
13. What is the massof ZY.OmL of Krrrt at STP? (2 marl<s)
h as 5= o - o l , s o L . , J ttto [, -9 3 9-t
L\.c+L
ttn, I
0.Oq3S
3
14. If 135 L of Cyanogengashasa ffrassof 313 gat STP,what is the molar massof
Cyanogen?(2 marks)
t3su] -Lg"!: 6'3 w,l
rno[=
St.r3/r*?
Itll' 3t3q\
$.rt3p",t
a2.4L
15. What volume at STP is occupiedby 5.75x 10r0moleculesof SbH319i
(2 marks)
22'4L --
[^'l,=
vo[=S?SKtolon^t..
yp'n
6enx
ntc
2-t{x lo-'T
I n tc,I
16.If 5.54 mL of Carbonoxysulphidegas.hasa massof 14.9rng at STP,what is the
molar massof Carbonoxysulphide?(2 marks)
("o.2lLt
O.ot4Tg
r,o['S.Sct
:
l{11=
2.frxroawl
-!{
^L zLcilooPL
2.4x10-'1".L
17. What is the densityof a Calcitecrystal,CaCO3,if 0.0316mol of CaCO: hasa
volume of 1.167mL? (2 marks)
gtU
=
, too't5,3.161 0-+
[\RSS=
0.0316orol
-v
v
t-i7a:.-t_
:-
2,1$/vL
I 8. How many moleculesare therein 64.0 g of FeSlg?Q ntarks)
(>'!Lx\&en[u:
,
4-38r,1&3uwlic
htc=64.oq,J+lJ 84.4q
t r"u,I
19. How manv molesiie in 2.15x 1023atomsof Fe?(2 marks)
rnu\tJ'lSx toaohu'
I nnrl
-
6-tl2xvobairrr^-
20. What volume at STP is occupiedby 275 mg of GeH+rrf (2 marks)
. !rg! . L2.4L, @
vol=o-2?s3
?6,6q
Tn""J
,)
10'* molec
molecules
1.85
.85x 10'"
noles areTn
areYn1
21. How manymoles
- of CsI? (2 marks
I . llv v v
T
tnpl :
r r L C , 'r L J
'"
,:
r r r vr vve r ve
vr
vv^
^
i *i
i.SsKl,offi^I,
- -v
, = Ii3.o+ wroliI
6'o?-xl'utL9rttc
at STP?(2 marks)
22.What is the massof 2.50 L of PFsrs,)
t + . l. 3