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Standard XII

Chemistry

Stoichiometric Calculations

How many kilo...

Question

How many kilograms of pure $H_{2} S O_{4}$ could be obtained from 1 kg of iron pyrites $(F e S_{2})$ according to the following reactions?
$4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}$
$2 S O_{2} + O_{2} \to 2 S O_{3}$
$S O_{3} + H_{2} O \to H_{2} S O_{4}$

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Solution

A required balanced equation is:
$4 F e S_{2} 4 m o l 4 \times 120 g + 15 O_{2} + 8 H_{2} O \to 2 F e_{2} O_{3} + 8 H_{2} S O_{4} 8 m o l 8 \times 98 g$

$4 \times 120 g$ of $F e S_{2}$ yield $H_{2} S O_{4} = 8 \times 98 g$
1000 g of $F e S_{2}$ will yield $H_{2} S O_{4} = \frac{8 \times 98}{4 \times 120} \times 1000$
$= 1.63 k g$

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Similar questions

Q. For the preparation of

H_{2} S O_{4}

from iron pyrite

[F e S_{2}]

involves following set of reaction.

F e S_{2} + O_{2} \to F e_{2} O_{3} + S O_{2}

S O_{2} + O_{2} \to S O_{3}

S O_{3} + H_{2} O \to H_{2} S O_{4}

Calculate the weight of

H_{2} S O_{4}

which can be obtained when

240 kg

F e S_{2}

is used.

Q. Which of the following reactions occur during calcinations?

(i)

C a C O_{3} \to C a O + C O_{2}

(ii)

4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}

(iii)

2 A l (O H)_{3} \to A l_{2} O_{3} + 3 H_{2} O

(iv)

C u_{2} S + 2 C u O \to 4 C u + S O_{2}

2 S O_{2} + O_{2} \to 2 S O_{3}

Rate of formation of

S O_{3}

according to the reaction is

1.6 \times 10^{- 3}

m i n^{- 1}

. Hence rate at which

S O_{2}

reacts is:

Q. Paragraph for below question

नीचे दिए गए प्रश्न के लिए अनुच्छेद

11.85 g KMnO₄ is dissolved in one litre of dil. H₂SO₄. To this solution, sufficient SO₂ gas is passed just to decolourise the purple colour of KMnO₄ solution.

2KMnO₄ + 5SO₂ + 2H₂O → K₂SO₄ + 2MnSO₄ + 2H₂SO₄

The SO₂ gas used in the above reaction is produced by oxidation of iron pyrites (FeS₂) as per the following reaction

4FeS₂(s) + 11O₂(g) → 2Fe₂O₃(s) + 8SO₂(g)

11.85 g KMnO₄ को एक लीटर तनु H₂SO₄ में घोला गया है। इस विलयन में, KMnO₄ विलयन के बैंगनी रंग को विरंजित करने के लिए पर्याप्त SO₂ गैस प्रवाहित की जाती है।

2KMnO₄ + 5SO₂ + 2H₂O → K₂SO₄ + 2MnSO₄ + 2H₂SO₄

उपरोक्त अभिक्रिया में प्रयुक्त SO₂ गैस को निम्नलिखित अभिक्रिया के अनुसार आयरन पाइराइट (FeS₂) के ऑक्सीकरण द्वारा प्राप्त किया जाता है।

4FeS₂(s) + 11O₂(g) → 2Fe₂O₃(s) + 8SO₂(g)

Q. What is the minimum mass of iron pyrites required in the above reaction?

[Atomic mass in u : O = 16, S = 32, K = 39, Mn = 55, Fe = 56]

प्रश्न - उपरोक्त अभिक्रिया में आवश्यक आयरन पाइराइट का न्यूनतम द्रव्यमान क्या है?

[u में परमाणु द्रव्यमान : O = 16, S = 32, K = 39, Mn = 55, Fe = 56]

Q. Paragraph for below question

नीचे दिए गए प्रश्न के लिए अनुच्छेद

11.85 g KMnO₄ is dissolved in one litre of dil. H₂SO₄. To this solution, sufficient SO₂ gas is passed just to decolourise the purple colour of KMnO₄ solution.

2KMnO₄ + 5SO₂ + 2H₂O → K₂SO₄ + 2MnSO₄ + 2H₂SO₄

The SO₂ gas used in the above reaction is produced by oxidation of iron pyrites (FeS₂) as per the following reaction

4FeS₂(s) + 11O₂(g) → 2Fe₂O₃(s) + 8SO₂(g)

11.85 g KMnO₄ को एक लीटर तनु H₂SO₄ में घोला गया है। इस विलयन में, KMnO₄ विलयन के बैंगनी रंग को विरंजित करने के लिए पर्याप्त SO₂ गैस प्रवाहित की जाती है।

2KMnO₄ + 5SO₂ + 2H₂O → K₂SO₄ + 2MnSO₄ + 2H₂SO₄

उपरोक्त अभिक्रिया में प्रयुक्त SO₂ गैस को निम्नलिखित अभिक्रिया के अनुसार आयरन पाइराइट (FeS₂) के ऑक्सीकरण द्वारा प्राप्त किया जाता है।

4FeS₂(s) + 11O₂(g) → 2Fe₂O₃(s) + 8SO₂(g)

Q. Find out the volume of SO₂ gas used in the above reaction at one atm pressure and 0ºC.

प्रश्न - एक atm दाब व 0ºC पर उपरोक्त अभिक्रिया में प्रयुक्त SO₂ गैस का आयतन ज्ञात कीजिए।

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How many kilograms of pure H2SO4 could be obtained from 1 kg of iron pyrites (FeS2) according to the following reactions? 4FeS2+11O2→2Fe2O3+8SO22SO2+O2→2SO3SO3+H2O→H2SO4

A required balanced equation is:4FeS24mol4×120g+15O2+8H2O→2Fe2O3+8H2SO48mol8×98g4×120g of FeS2 yield H2SO4=8×98g1000 g of FeS2 will yield H2SO4=8×984×120×1000=1.63kg

How many kilograms of pure $H_{2} S O_{4}$ could be obtained from 1 kg of iron pyrites $(F e S_{2})$ according to the following reactions?
$4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}$
$2 S O_{2} + O_{2} \to 2 S O_{3}$
$S O_{3} + H_{2} O \to H_{2} S O_{4}$