四日月一十〇九九一)年九十七國民莖中
寶收、日八初月十年午庚醫
1.2 The mass of one hole of the
constituent particles supstance
1991 中學會考預習專欄:
明德出版社
MILL & DALE PRESS
Chemistry. (8)
16x41
LA
1.8 Thus, for ausubstance
Unit 5: Revision
notes
chemical
Mass of X un orams:
calcutations
誠聘學位教師
Hasic Concepts"
1/14
12.22
報日僑華
六期星 日四廿月一十〇九九一)年九十七國民華中( 28
moles of a gas must contain the?
0.4 X
0.01mg1.
same number the Avogadro number) of moleculeis..
2016
1.13 A Molar solution of a substance is. one that contains one mole of the. substance. dissolved in cm 感 the solutions
What Is the volume of oxygen required co-burr competen gaseous mixture consisting -40 cm3 of methane (CH
Now 123 g
45
22400 65-
448
Galculations or Chemical Formulae 2.1. The empirical (simplest formula of compound show its carsti Luont atons and their simpleat integral ration:
as
an adoricat
24. Ethäne
formula of Ch2 indicatiny that it 15 composed of Cand Hatoms in the ratio 1:3.
2.2 The molecular formula of
substance shows the actual number of each kind of atoms in its ngibcules
e.y. Ethana, hōs
0.7 50 cm3 of 。 mixture of methane
(CH) and echarle FC_8;)
exactly 15 em nt oxygen for complete combust fun wha is thu of the composition by volun criginal mixture?"
0.8 12 cm 0 a gaseout sycrocarbun
requires 35 cm of oxygen for complete combustion, giving off 5f carbon diode. Calculate its molecider formula,
-24
0.6 NIB. Write a separate equation for
combustión
2019)
wrds by Avoyadro
200(9) +0,19)
yo) by Ava
62.99
10.7 NA Kpte que separat
the combustiga
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The relative atomic mass 4A)
in element is defined d.
"average"
T
→lerent relative to the mass, n1 atom of carbon-12, takendy exactly.
of ar
ferent
units
Mass of an average' atom.of.the.eTeren
Mass of an atom of
a ratio and hence has no
The mass of an "average" atom of an element is the weighted neen vf).
the masses of all its isotopes. taking both the isotouic
masses and proportions
chlorine, exists
isotopes and the ratic
15x3+37x1
The relative molecular mass (M)
of a substance is just the sim
the relative atomic masses of thie. atoms.contained
lecular formula
8.9, M 49,50,} = 1x2+32x+15x4.
1-3 he formula mass (F)
compound is just the sum
relative, atomic masses.
toms contained in
(simplest) fetula ·
Frample is ucet vnnd jaysing; a
of a substanech Curtains as
many elementaremisses of tre
atcns fo
Ther are carbon
·suhstances.
(12.00 gl of carbon-
0.012 K
The elementary entities: cofer to
any type of particle that may
represent they
constitution of
under investigation,
molecules, ions, elections,
w(x) denotes the
substance
(0) 0.2 mo1;.
4.5/thias been found that 12:00
volume of a substance.
one volume occupied by one note of
sts constituent particles particular, temperature pressure.
the
molecular
Formula of C5H6-
Thus, ・for".
covalenty
Solutions to the Problems
0,5t Formula mass of Ra
*1CH0 = 286
Substance X
Molecular Formule Cf X-
粉就请问cical Formulaf
where n is an nteger.
ate Fand
0.1 Calculate.
Molar volume Molar mass ? X-
Dens ty of
1010 Avases have the same mola",
volume at the same temperature and Dressure
The molar volume of gas is about
22.4 m
mut 2410' dp - at
atmospheric pre
Thus, ter gas
·Volume nf
24000
0.003 mal
4.11 The concentration of a solutions commonly expressed. In terms of the "number of moles of the solute in son" cubic""." decimetre of the solution. ty bab nge WRIT
mo) dra
its molarity and denoted as M.
Thus
solute X
Concentration DI
a
Amcunt ct salute.
Kin moles Voligme of the
solution in on
2.8 g of anydrous sodium carbonate dissolved. water to give 400 solut fon. What
concentration?
|_ M{ Nə2=0; } } = 106 §°mpi
Votal solution.
KONG
carbon-12 contains 0.02*107 Carbon atoms. This number 6.02x1023 is called the Avagadro, number denoted as L. Thus, a molo often refers to the Avogacro: number of particles of afiy particular kind, n.y, alom, Fous, molecules, cary, etc..
1.6 Une mole of a substance is Just
: its relative atomio mass. for;
aloms) relative molecular mast.
ions
(for molecules or formula mass (for Tonic compounds "br -expressed in 'grammes.
0.5 mal
for, 0.5%)
with a known concentration readily found by sing the rélatichefjip.belce.
Amount of salute Molarity. x val. of
males
solution in dịn 3°
二博覽旅遊工國·漢堡•市吉嘉
porcentage composition by mass of hydrated *sodium Carbonate (MayCl*10H3),
Q.2. A hydralynas
percentage scmposition by and 20.25% irer 15,5% 1phor, 23.06% oxygen and 45,30% water. Find its empirical formula gi
0.3 -lydrated magnesium sulphate.
(Mo50, **F20) cons sts of 40.9% fy mass of the anhydrous, salt, what is the value of x?
Calculations on Chemical Equations 425, 3 of had(T, HI, IV) oxidè lead using
mass of lege
acted,
[hydrates, the
Metal Buis by Groupe Panjodic Table 1.5 g of at adder to sepa flüte hver
ortas
acid, 448 cm of hydrogen gas is collected at...p. and 0.2.0. 6f the metais left behinde What is its relative atomic mass of B.
Calculations on. Volumes in Gasedus Reactions:
-4.1 Gay-Lussac's Law of-Combining
Volumes states that when gazes. react, they do so in volumes which bear a simple ratto to one another and to the volumes of the products if gaseous, provided that. alt volumes are measured at, or corrected, to the same teinfrizure and pressure.
avg. It is found that 50 on of
hitrogen reacts. Wita 150°cm of nydrogen
150:100
produce
Hyrvol
(simple wholes
raviol
Im Avogadros Law states that equal volumes of all gases, at the samp, Cemperature and apres ire. contain 'an. eijua kanumber molecules.
Deverse
0.4 MP
IBR
true ve. Cual number molecules will lave equal volume, measured at the. sene temperature and pressure.
Avogadro's kaw
olul gas
3x207
2685.
685
number of moleculés
0.448 dm
448
4.3 The Avogadro's Las also explains.
hases move the same mar
They
Avogacro
pressure,
This is because
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