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Dubai

IGCSE Chemistry Stoichiometry Analysis

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Published in: Chemistry
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here we will discuss about the mole , concentration , Avagadro number etc

Babar M / Dubai

10 years of teaching experience

Qualification: Master of science in chemistry(MSC CHEMISTRY), Bachelors of science in Chemistry, ( BSC biology) Biology , A levels , o levels

Teaches: Biology, Chemistry, Microbiology, Biochemistry, Molecular Biology, IGCSE/AS/AL, Science, Environmental Science, Maths, Home Science

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  1. I GCSE STOIC CAMBRI and OX HEMISTRY WITH BABAR HEMISTRY OMETRY GE , AQA , EDXCEL ORD
  2. STOACHAOMETRY CHARGES OF cowwå0N Name Ammonium Nitrate Hydroxide Carbonate Sulfate Formula NH4+ N03 OH- SO 42 _ Charges +1 -2 -2
  3. Molecular Formula: The number and type of different atoms in one molecule Empirical Formula: The simplest whole number ratio of the different atoms or ions in a compound. Molecular Formula to Empirical Formula Caculation Molecular formula = n (emiracal formula )
  4. The formula of a simple and ionic compound from the relative numbers of atoms present in a model or a diagrammatic representation Element Mass (g) Number of moles Of atoms Ratio of moles Simplest ratio of moles Aluminium. Al 1.08 1.08 = 0.04 27 004 0.04 2 Oxygen, O 0.96 0.96 = 0.06 16 006 = 1.5 0.04 3
  5. STATE SYMBOLS ANO EOUATAONS Balancing equations: A chemical equation is balanced when there are an equal number of atoms and charges on both sides of the equation State symbols: (s) = solid • (l) = liquid • (g) = gas (aq) = aqueous solution Names of compounds • A compound ending with -ide only contains two different elements • A compound ending with -ate contains oxygen
  6. vassö OF ATOMS ANO elative Atomic Mass (A): the average mass of the isotopes of an element compared to 1/ 12th of the mass of an atom of 12C . For example atomic mass of oxugen is 8. Relative Molecular Mass (M): sum of relative atomic masses of all the atoms in one molecule of the compound. For example molecular mass of H2 0 is 18
  7. ANO AVOGADRO CONSTANT A mole of a substance is the amount that contains the same number of units as the number of carbon atoms in 12 grams of carbon-12 A mole is the Ar or Mr expressed in grams e.g. 1 mole of Carbon-12 is equal to 12 grams. @ It is equal to 6.02 x 1023 particles; this number is called Avogadro's constant. @ 1 mole also occupies a volume of 24dm3 at room temperature and pressure
  8. Number of Moles Amount of Substance=massmolar massAmount of Substance-mola r massmass Amount of Substance (mol) Mass (g) Molar Mass (Mr) in (g/mol) Example A student wei hs out a 3.24 g3.24 g sample of iron (Ill) oxide for a reaction. Calculate the number of moles present in the sample:? Number ofNumber ofMoles Iron (Ill)Moles Iron (Ill)Oxide=Mass of Ir on (Ill) OxideMr Iron(lll) molOxide=Mr Iron(lll ) OxideMass of Iron (Ill) Oxide=1603.24=0.02 mol
  9. CONCENTRATAON AOAOUS SOLUTAON Number of Moles in Aqueous Solution Moles=ConcentrationxVolumeMoles= Moles (mol) Concentration (mol/dm3) Volume (24 dm3) EXAMPLE : How many moles are produced by 6mol dm-3 concentration solution in 500 cm3 solution ?
  10. CONCENTRATPON Concentration Concentration=no. of moles/ VOLUME Moles per drn3 • Imol/dm31mol/dm3 Grams per dm3dm3, g/dm3g/dm3 Concentration can be measured and converted into g/dm3g/dm3 or mol/dm3mol/dm3, by multiplying the molar mass of the compound.
  11. Problem 1 @ If 138.6 g of KCIO 3 is heated and decomposes completely, how many grams bf oxygen gas would be produced? Problem 2 How many grams of iodine must react to give 4.63 grams of ferric iodide? Problem 3 How many grams of H20 will be produced when you burn 25 grams of methane?
  12. N/A

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