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Chemistry 2 yousef berbar

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Chemistry 2 yousef berbar

1. 1. S e c t i o n t h r e e B y : Y o u s s ef B e r b ar
2. 2.  Mole : 6.022 x 10^23 units, the number equal to the number of carbon atoms in exactly 12 g of pure C 12  Molar mass : the mass of one mole of a pure substance.  Avogadro no : 6.022 x 10^23
3. 3. How to calculate :  How to know atomic mass ?! If we have a element that has 2 isotopes and we want to calculate the atomic mass we follow the following rule : Ratio of isotope one * its mass + ratio of isotope 2 * its mass = no its unit is Amu , also it is written under the element symbol in the periodic table  Molar mass = Molecular mass = atomic mass in its magnitude
4. 4. What is the difference between molar , molecular and atomic mass  Both of them are equal in magnitude but the unit of atomic mass is Amu and the unit of molar and molecular mass is g / mole  Another example what is the molar mass of co2 : 12 g / mole  calculate the molecular mass of water (H2O) (1.01 amu + 1.01 amu + 16.00 amu) = 18.02 Amu or 18.02 g / mole  Molar mass of element is no. g / mole . What means ? Molar mass = mass / Avogadro no ( no of moles ) No of moles = mass / molar mass
5. 5. Some definitions  standard temperature and pressure (STP):standard temperature is 273.15 kelvins and standard pressure is 760 mm Hg ( 1 atm).  Stoichiometry : the study of the relationships (mass- mole-volume) among substances involved in chemical reactions.  dimensional analysis : a name for “equivalent measures.” A method for solving problems that involves canceling units.
6. 6.  The equation also shows that 2 mol C8H18 react with 25 mol O2 to form 16 mol CO2and 18 mol H2O.  No of mole = mass / molar mass  Density = mass / volume
7. 7. Problem one
8. 8. Solution of problem one  Mole ratio =  We have 312 moles of ammonia so ,
9. 9. Problem two
10. 10. Solution of problem two
11. 11. Problem Three
12. 12. Solution of problem Three
13. 13. Problem four
14. 14. Solution of problem four
15. 15. Thanks for listening Youssef Berbar