Mehlala ea Lipotso tse Buisanang ka Khopolo ea Li-Moles
Ho ithuta mohopolo oa mole ke motheo oa bohlokoa k'hemistri. Khopolo ena e thusa ho utloisisa mokhoa oa ho lekanya bongata ba lintho tse amehang liketsong tsa lik'hemik'hale. Sehloohong sena, re tla hlahloba mathata a sampole le ho buisana ka mohopolo oa mole ho re thusa ho utloisisa le ho o sebelisa ka katleho. A re qaleng ka ho utloisisa hore na mole ke eng.
Mole ke eng?
Mole ke yuniti ea motheo Tsamaisong ea Machaba (SI) bakeng sa bongata ba ntho. Mole e le 'ngoe ea ntho e na le palo e lekanang ea likaroloana joalo ka ha ho na le liathomo ka har'a ligrama tse 12 tsa carbon-12. Palo ena e tsejoa e le nomoro ea Avogadro, e leng likaroloana tse 6,022 x 10^23 (liathomo, limolek'hule, li-ion, kapa likaroloana tse ling).
Ke Hobane'ng ha Khopolo ea Mole e le ea Bohlokoa?
Khopolo ea mole e bohlokoa hobane lintho tse ngata k'hemistri li sebelisana ka tekanyo e itseng. Ho utloisisa mole ho re lumella ho fumana hore na limolek'hule kapa liathomo tse kae li ameha karabelong ea lik'hemik'hale. Ho feta moo, re sebelisa limolek'hule, re ka bala boima ba ntho e hlokahalang kapa e hlahisoang karabelong.
Metheo ea Khopolo ea Mole
Pele re kena lipotsong tsa mohlala, ho na le likhopolo tse 'maloa tsa motheo tse lokelang ho utloisisoa:
1. Nomoro ea Avogadro (N\(_A\)): 6,022 x 10\(^{23}\)
2. Molar Mass (M): Boima ba mole e le 'ngoe ea ntho. Yuniti ea molar mass ke ligrama ka mole (g/mol).
Liforomo tsa Bohlokoa:
1. Palo ea li-moles (n):
\[ n = \frac{m}{M} \]
moo \( m \) e leng boima ba ntho ka digrama, mme \( M \) ke boima ba molar.
2. Palo ea Likaroloana:
\[ N = n \makgetlo N_A \]
3. Bophahamo ba Khase ho STP (Mocheso o Tloaelehileng le Khatello):
Ho STP (0°C le khatello ea atm e le 1), mole e le 'ngoe ea khase e ntle e nka bophahamo ba 22,4 L.
\[ V = n \makgetlo a 22,4 \]
Lipotso tsa Mehlala le Puisano
Mohlala oa Potso ea 1: Ho Bala Palo ea Li-Moles ho tloha Boima
Potso: Ka lebaka la boima ba digrama tse 16 tsa oksijene, ho na le dimolekhule tse kae tsa oksijene?
Puisano:
Mohato oa pele ke ho fumana boima ba molar ba oksijene. Oxygen (O\(_2\)) e na le boima ba molar ba 32 g/mol (hobane 16 g/mol ka athomo e atisitsoe ka 2).
Ho sebelisa foromo:
\[ n = \frac{m}{M} = \frac{16 \ \text{g}}{32 \ \text{g/mol}} = 0.5 \ \text{mol} \]
Kahoo, palo ea li-mole tsa oksijene ke li-mole tse 0,5.
Mohlala oa Potso ea 2: Ho Bala Boima ho tloha Palo ea Li-Moles
Potso: Li-mole tse 3 tsa carbon dioxide (CO2) ke ligrama tse kae?
Puisano:
Taba ea pele, bala boima ba molar ba carbon dioxide (CO2):
– Khabone (C) = 12 g/mol
– Oksijene (O) = 16 g/mol
Boima ba molar ba CO\(_2\) ke:
\[ M(CO_2) = 12 + (2 \makgetlo a 16) = 44 \ \text{g/mol} \]
Ho sebelisa foromo:
\[ m = n \makgetlo M \]
\[ m = 3 \ \mongolo{mol} \makgetlo a 44 \ \mongolo{g/mol} = 132 \ \mongolo{g} \]
Kahoo, boima ba limole tse 3 tsa CO\(_2\) ke ligrama tse 132.
Mohlala oa 3: Ho Bala Palo ea Likaroloana ho tloha Boima
Potso: Ho na le liathomo tse kae tsa khabone ka har'a ligrama tse 6 tsa khabone?
Puisano:
Taba ea pele, bala palo ea li-moles tsa khabone. Boima ba molar ba khabone ke 12 g/mol.
\[ n = \frac{m}{M} = \frac{6 \ \text{g}}{12 \ \text{g/mol}} = 0,5 \ \text{mol} \]
Palo ea likaroloana (liathomo) tse sebelisang nomoro ea Avogadro:
\[ N = n \makgetlo N_A \]
\[ N = 0,5 \ \mongolo{mol} \ka makhetlo a 6,022 \ka makhetlo a 10^{23} \ \mongolo{dikarolo/mol} \]
\[ N = 3,011 \makgetlo a 10^{23} \ \mongolo{dikaroloana} \]
Kahoo, ho na le liathomo tsa khabone tse 6 tsa ligrama tsa khabone tse 3,011 makhetlo a 10^{23}.
Mohlala oa Potso ea 4: Ho Bala Bophahamo ba Khase ho STP
Potso: Ke lilithara tse kae tsa bophahamo tse nkiloeng ke limole tse 2 tsa khase ea naetrojene (N\(_2\)) ho STP?
Puisano:
Ho STP, mole e le 'ngoe ea khase e ntle e nka bophahamo ba 22,4 L.
Ho sebelisa foromo:
\[ V = n \makgetlo a 22,4 \]
\[ V = 2 \ \mongolo{mol} \makgetlo a 22,4 \ \mongolo{L/mol} = 44,8 \ \mongolo{L} \]
Kahoo, bophahamo ba modumo bo nkiloeng ke li-mole tse 2 tsa khase ea naetrojene ho STP ke lilithara tse 44,8.
Mohlala oa Potso ea 5: Ho Bala Li-Moles ho tsoa Palong ea Likaroloana
Potso: Ho na le limolek'hule tse kae ka har'a limolek'hule tsa metsi tse 3,011 x 10\(^{23}\) (H\(_2\)O)?
Puisano:
Ho sebelisa kamano pakeng tsa palo ea likaroloana le li-mole (Nomoro ea Avogadro):
\[ n = \frac{N}{N_A} \]
\[ n = \frac{3,011 \times 10^{23} \ \text{particles}}{6,022 \times 10^{23} \ \text{particles/mol}} = 0,5 \ \text{mol} \]
Kahoo, ho na le limolek'hule tse 0,5 tsa limolek'hule tsa metsi ho limolek'hule tsa metsi tse 3,011 x 10\(^{23}\).
Qetello
Ho ithuta mohopolo oa li-moles ho bohlokoa bakeng sa ho utloisisa liketso tsa lik'hemik'hale le ho bala bongata ba lintho tse amehang. Ka ho tseba lintho tsa motheo le mekhoa e amanang le tsona, re ka araba mathata a fapaneng a amanang le li-moles habonolo. Re tšepa hore mehlala ea mathata le lipuisano tse kaholimo li u thusitse ho utloisisa hamolemo mohopolo oa li-moles le mokhoa oa ho o sebelisa mathateng a fapaneng a k'hemistri.
Thuto e monate 'me u tsoele pele ho ikoetlisa ho ba le boiphihlelo bo eketsehileng!
