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# Mole

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### Mole

1. 1. MATTER AROUND US CHEMICAL FORMULAE AND EQUATIONS X NA1 Mole95 4.816 x 1023 Particle 3.01 6.02 24 ÷ NA
2. 2. C C ATOM Number of mole atomParticles MOLECULE Number of mole molecule ION Number of mole ion
3. 3. ExampleC Count number of atom in 0.4 mole atom carbon. Solution: 0.4 mole ? Atom carbon Number of mole Get the atom carbon = 0.4 information mole from question So, number of atom carbon is, use the = 0.4 x Avogadro constant relationship = 0.4 x 6.02 x 1023 atom in figure 1 = 2.48 x 1023 atoms
4. 4. Relationship for x NA x depending on formulas chemistry Number of mole Number of molecule Number of atom molecule ÷ NA ÷ depending on formulas chemistry O H2 mole molecule H2 Molecule H2 = Atom H = 2 x NA 2 x NA x 2
5. 5. Example There are 3 mole gases hydrogen, H2 in one container, Count; • Number of molecule hydrogen, H2 • Number of atom hydrogen Solution : Number of mole molecule hydrogen, H2 = 3 mole molecule hydrogen, H2 Get the information from the question3 mole molecule of hydrogen, H2 ? Molecule hydrogen, H2a) So, number of molecule hydrogen, H2 ; Use the= 3 x Avogadro Constant relationship in= 3 x 6.02 x 1023 molecule figure 2= ___________ molecule
6. 6. There are 3 mole gases in one container, b) Number of atom hydrogen3 x 6.02 x 1023 molecule hydrogen, H2 ? Atom hydrogen Analysisb) Every molecule hydrogen, H2 consist of 2 atom formulaehydrogen. So, number of atom hydrogen in the gas container; molecule H2 = 2 x number of molecule hydrogen, H Use the = 2 x 3 x 6.02 x 1023 atom relationship in = ______________ atom figure 2 H H
7. 7. EXAMPLE Molecule of water H2OSample of water consist of 1.806 x 1024molecules, count; O • Number of mole water H H molecule • Number of atom oxygen • Number of atom hydrogen in the sample.
8. 8. Solution; 1.806 x 1024 molecule ? Molecule water water a) Number of molecule water = 1.806 x 1024 Get theSo, number of mole molecule water; information from= 1.806 x 1024 ÷ NA question= 1.806 x 1024 6.02 x 1023= 3 mole molecule of water
9. 9. 1.806 x 1024 molecule ? Moleculewater water b) 1 molecule water consist 1 atom oxygen So, 1.806 x 1024 molecule of water consist of 1.806 x1024 atom of oxygen O H H
10. 10. c) Every molecule water, H2O consist of 2 atom hydrogen. So, number of atom hydrogen in thesample;= 2 x number of molecule hydrogen. H= 2 x 2 x 6.02 x 1023 atom= 4 x 6.02 x 1023 atom= 2.408 x 1024 atom O H H
11. 11. Relationship for x depending on formulas x NA chemistryNumber of mole ion Number of unit Number of ion ÷ NA ÷ depending on formulas chemistry
12. 12. ExampleCount number of units in 4 mole NaCl. Solution;1 mole substance 6.02 x 1023 units So; 4 mole NaCl = ? units 4 mole NaCl = 4 x 6.02x 1023 = 2.408 x 1024 units NaCl
13. 13. Count number of ions of Cl- in 4 mole NaCl.One units of NaCl have 1 ion Cl- So;One mole unit of NaCl ? ion Cl- 1 mole units of NaCl = 6.02 x 1023 ions 4 mole units of NaCl = 4 x 6.02 x 1023 ions = 2.408 x 1024 ions