Mibvunzo yeMienzaniso & Kukurukurirana kweTsanangudzo yeStoichiometry
Stoichiometry ibazi rekemesitiri rinoongorora huwandu hwezvinhu zvinobatanidzwa mukuita kwemakemikari. Izwi rekuti 'stoichiometry' pacharo rinobva pamashoko echiGiriki ekuti "stoicheion," zvichireva chinhu, uye "metron," zvichireva chiyero. Stoichiometry inotarisa pahuwandu hwemamoles, huremu, vhoriyamu, uye zvidimbu mukuita kwemakemikari. Stoichiometry inokosha mukemesitiri nekuti inopa hwaro hwekuongorora maitiro uye inobatsira masayendisiti kuona huwandu hwezvinhu zvinodiwa kana zvinogadzirwa mukuita kwemakemikari.
Kuti tinzwisise pfungwa yestoichiometry zviri nani, ngatikurukurei mimwe mienzaniso yemibvunzo nehurukuro dzayo.
Muenzaniso weMibvunzo yeStoichiometry
Mubvunzo 1: Maitiro akareruka emakemikari
Funga nezvemhinduro inotevera:
\[ \text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O} \]
Kana tikatanga nemamota mana eH₂ nemamota mana eO₂, mamota mangani eH₂O achaumbwa? Zvinoita kuti zvinhu zvisashande here, kana kuti pane zvimwe zvasara?
Kukurukurirana:
Danho rekutanga nderekunyora balanced chemical equation:
\[ \zvinyorwa{2H}_2 + \zvinyorwa{O}_2 \museve wekurudyi \zvinyorwa{2H}_2\zvinyorwa{O} \]
Iyi equation inoratidza kuti mamoles maviri eH₂ anoita zvakafanana nemoles imwe yeO₂ kuti abudise mamoles maviri eH₂O. Kubva pane izvi, tinogona kuwana huwandu hwemamoles eH₂O anogadzirwa tichishandisa stoichiometry.
1. Tsvaga mamota ezvakawandisa uye akashandiswa:
Pamamota maviri eH₂, tinoda mole imwe yeO₂. Tinotanga nemamota mana eH₂ uye mamota mana eO₂.
– \( \frac{4 \text{ mol H₂}}{2} = 2 \text{ mol O₂} \) inodiwa.
– Sezvo tine mamoles mana eO₂, O₂ ndiyo chinhu chasara.
2. Verenga huwandu hwezvigadzirwa:
Saizvozvowo, mamoles mana eH₂ achaburitsa huwandu hwakaenzana hwemamoles eH₂O nekuti mamoles maviri eH₂ anopindura anoburitsa mamoles maviri eH₂O.
\[ 4\text{ mol H₂} \times \frac{2 \text{ mol H}_2\text{O}}{2 \text{ mol H}_2} = 4 \text{ mol H}_2\text{O} \]
Saka, mamota mana emvura achaumbwa, uye O₂ yasara haizoshandiswi.
Mubvunzo 2: Kupisa Kunoitika
Benzene (C₆H₆) inopisa muokisijeni kuti ibudise kabhoni dhayokisaidhi nemvura sezvinotevera:
\[ 2\text{ C}_6\text{H}_6 + 15\text{ O}_2 \rightarrow 12\text{ CO}_2 + 6\text{ H}_2\text{O} \]
Kana mole imwe yeC₆H₆ ikapiswa, mamoles mangani eCO₂ neH₂O achaumbwa? Mamoles mangani eO₂ anodiwa?
Kukurukurirana:
Shandisa equation ye stoichiometric iri pamusoro apa kugadzirisa dambudziko:
1. Tsvaga mamota eCO₂ neH₂O anogadzirwa:
\[ \text{C}_6\text{H}_6 \]
\[ 1 \text{ mol C}_6\text{H}_6 \text{ yakaenzana na } 12 \text{ mol CO}_2 (ye 2 mol C}_6\text{H}_6) \]
Kubva pachiyero chestoichiometric:
\[ 1 \zvinyorwa{ mol C}_6\zvinyorwa{H}_6 = \frac{12 \zvinyorwa{ mol CO}_2}{2} \]
\[ = 6 \text{ mol CO}_2 \]
Saizvozvowo kune H₂O:
\[ 1 \text{ mol C}_6\text{H}_6 = \frac{6 \text{ mol H}_2\text{O}}{2} \]
\[ = 3 \zvinyorwa{ mol H}_2\zvinyorwa{O} \]
2. Sarudza mamoles eO₂ anodiwa:
\[ 1 \text{ mol C}_6\text{H}_6 = \frac{15 \text{ mol O}_2}{2} \]
\[ = 7.5 \chinyorwa{ mol O}_2 \]
Mubvunzo 3: Maitiro Ekusagadzikana kweAcid-Base
Mangani marita eCO₂ gasi anogadzirwa (pasi pemamiriro akajairwa) kana 5 g yesodium carbonate (Na₂CO₃) ikasanganiswa nehydrochloric acid yakawandisa zvichienderana nekuita:
\[ \text{Na}_2\text{CO}_3 + 2\text{HCl} \rightarrow 2\text{NaCl} + \text{H}_2\text{O} + \text{CO}_2 \]
Kukurukurirana:
1. Tsvaga mamota eNa₂CO₃:
Molar huremu hweNa₂CO₃:
\[ (2 \kawa 23) + 12 + (3 \kawa 16) = 106 \text{g/mol} \]
Mamoles eNa₂CO₃ anowanikwa:
\[ \frac{5 \zvinyorwa{ g Na₂CO₃}}{106 \zvinyorwa{ g/mol}} = 0.047 \zvinyorwa{ mol Na₂CO₃} \]
2. Mangani mamoles eCO₂ anoumbwa:
\[ 1 \chinyorwa{ mol Na₂CO₃} inogadzira 1 \zvinyorwa{ mol CO}_2 \]
Saka 0.047 mol yeNa₂CO₃ ichaburitsa:
\[ 0.047 \text{ mol CO}_2 \]
Mumamiriro ezvinhu akajairwa (STP: 22.4 L/mol):
\[ 0.047 \text{ mol } \times 22.4 \text{ L/mol} = 1.05 \text{ L CO}_2 \]
Mhedziso
Kubva mumuenzaniso wedambudziko riri pamusoro apa, tinogona kuona kuti stoichiometry inosanganisira matanho akakosha akati wandei: kushandura huremu kuita mamoles, kushandisa molar ratios kubva ku balanced equations, uye pakupedzisira kushandura kudzokera kumayuniti anodiwa. Kunzwisisa stoichiometry kwakakosha kuti ubudirire mukuongorora maitiro emakemikari uye kuronga kugadzirwa kwemakemikari. Nekuramba uchidzidzira, stoichiometry ichave chishandiso chinobatsira zvikuru munyika yekemistri.
