SINHA I.I.T. CHEMISTRY 1-D 10 Talwandi & B-7. JAWAHAR NAGAR.Main Road Kota Ph-0744-2422383 .Mo-93149-05055 1 Mole Concept (stoichiometry)2 Q.1 1 gm dry green algae absorbs 4.7 X 10 -3 mole of CO 2 per hour by photosynthesis. If the fixed carbon atoms were all stored after the photosynthesis as starch (C 6 H 10 O 5 )n, .how long would it take for algae to double its own weight assuming photosynthesis taking place at a constant rate? Q.2 A certain metal M forms an insoluble oxalate complex M 4 O 3 (C 2 O 4 ) 3 .12H 2 O.If 3.38 g of the complex are formed from 1gm of oxalic acid (H 2 C 2 O 4 ). What is the atomic weight of M.? Q.3 Sodium chloride of 94% purity is used to produce salt cake Na 2 SO 4 of 83% purity according to the equation. 2NaCl+H 2 SO 4 Na 2 SO 4 +2HCl Calculate the number of Kg of NaCl required to produce 1 Kg of salt cake. Q.4 Prior to combustion organic sulphur has to be removed from coal. Examine the following equations. R 1 -S-R 2 +2NaOH R 1 -O-R 2 +Na 2 S+H 2 O Na 2 S+H 2 O+CO 2 Na 2 CO 3 +H 2 S Na 2 CO 3 +Ca(OH) 2 2NaOH+CaCO 3 CaCO 3 CaO+CO 2 CaO+H 2 OCa(OH) 2 How many kg of CaCO 3 would be needed per metric ton of coal with 1% sulphur content, to produce Ca(OH) 2 sufficient to regenerate the NaOH used in process . Q.5 The following process has been used to obtain iodine from oil-field brines in California NaI + AgNO 3 AgI+NaNO 3 2AgI + F FeI 2 +2Ag 2FeI 2 +3Cl 2 2FeCl 3 +I 2 How many gram of AgNO 3 are required in the first step for every kg I 2 produced in the third step. Q.6 CS 2 and Cl 2 in the weight ratio 1:2 are allowed to react according to CS 2 + 3Cl 2 CCl 4 + S 2 Cl 2 Which reactant and what fraction of it is left over? Q.7 A fluoride disposal plant was constructed to carry out the following reactions: F 2 + 2NaOH 1/2O 2 + 2NaF + H 2 O 2NaF + CaO + H 2 O CaF 2 + 2NaOH As the plant operated enough lime was added from time to time to just bring out the complete precipitation of fluoride as CaF 2 . Over a period o ftime 2000 kg of fluoride was fed into the plant and 6000 kg of lime was added. What wa the percentage utilization of lime? Q.8 There is available 10 ton of a coal sample containing 2.5 % sulphur. Two coal sample containing 0.8% and 1.1% sulphur are also available. How many tons of each of the later two samples should be mixed with the original 10 ton to give 20 ton sample containing 1.7% sulphur? Q.9 NaBr used to produce AgBr for use in photography can itself be prepared as follows: Fe+Br 2 FeBr 2 FeBr 2 +Br 2 Fe 3 Br 8 Fe 3 Br 8 +Na 2 CO 3 NaBr +CO 2 +Fe 3 O 4 How much Fe, in kg is consumed to produce 2.50 X 103 kg NaBr? Q.10 A mixture of Xe and F 2 was heated and the white solid so formed reacted with H 2 to give 81 ml of Xe at STP and HF. The HF formed required 68.43 ml of 0.3172 M NaOH for complete neutralization . Determine empirical formula of white solid. ANSWERS Q.1. 7.88hr Q.2 Mo Q.3 0.727 kg impure NaCl Q.4 31.25 kg Q.5. 1.34X10 3 g AgNO 3 Q.6. 0.286 of CS 2 Q.7. 49.12% Q.8 3.3 ton of 1.1% and 6.7 ton of 0.8% Q.9 509 Kg Fe Q.10. XeF 6

bansal pattern Stoichiometry Advance by S.K.sinha See Chemistry Animations at sinhalab.com

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SINHA I.I.T. CHEMISTRY Mole Concept (stoichiometry)2 Q.1 Q.2 Q.31Q.4Q.5Q.6Q.7Q.8Q.9Q.101 gm dry green algae absorbs 4.7 X 10-3 mole of CO2 per hour by photosynthesis. If the fixed carbon atoms were all stored after the photosynthesis as starch (C6H10O5)n, .how long would it take for algae to double its own weight assuming photosynthesis taking place at a constant rate? A certain metal M forms an insoluble oxalate complex M4O3(C2O4)3.12H2O.If 3.38 g of the complex are formed fro

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Page 1: bansal pattern Stoichiometry Advance by S.K.sinha See Chemistry Animations at sinhalab.com

SINHA I.I.T. CHEMISTRY

1-D 10 Talwandi & B-7. JAWAHAR NAGAR.Main Road Kota Ph-0744-2422383 .Mo-93149-05055

Mole Concept (stoichiometry)2 Q.1 1 gm dry green algae absorbs 4.7 X 10-3 mole of CO2 per hour by photosynthesis. If the fixed carbon atoms were all stored after the photosynthesis as starch (C6H10O5)n, .how long would it take for algae to double its own weight assuming photosynthesis taking place at a constant rate? Q.2 A certain metal M forms an insoluble oxalate complex M4O3(C2O4)3.12H2O.If 3.38 g of the complex are formed from 1gm of oxalic acid (H2C2O4). What is the atomic weight of M.? Q.3 Sodium chloride of 94% purity is used to produce salt cake Na2SO4 of 83% purity according to the equation. 2NaCl+H2SO4Na2SO4+2HCl Calculate the number of Kg of NaCl required to produce 1 Kg of salt cake. Q.4 Prior to combustion organic sulphur has to be removed from coal. Examine the following equations. R1-S-R2+2NaOH R1-O-R2+Na2S+H2O Na2S+H2O+CO2Na2CO3+H2S Na2CO3+Ca(OH)2 2NaOH+CaCO3 CaCO3 CaO+CO2 CaO+H2OCa(OH)2 How many kg of CaCO3 would be needed per metric ton of coal with 1% sulphur content, to produce Ca(OH)2 sufficient to regenerate the NaOH used in process . Q.5 The following process has been used to obtain iodine from oil-field brines in California NaI + AgNO3 AgI+NaNO3 2AgI + F FeI2+2Ag 2FeI2+3Cl22FeCl3+I2

How many gram of AgNO3 are required in the first step for every kg I2 produced in the third step. Q.6 CS2 and Cl2 in the weight ratio 1:2 are allowed to react according to CS2 + 3Cl2 CCl4+ S2Cl2 Which reactant and what fraction of it is left over? Q.7 A fluoride disposal plant was constructed to carry out the following reactions: F2 + 2NaOH 1/2O2 + 2NaF + H2O 2NaF + CaO + H2O CaF2 + 2NaOH As the plant operated enough lime was added from time to time to just bring out the complete precipitation of fluoride as CaF2. Over a period o ftime 2000 kg of fluoride was fed into the plant and 6000 kg of lime was added. What wa the percentage utilization of lime? Q.8 There is available 10 ton of a coal sample containing 2.5 % sulphur. Two coal sample containing 0.8% and 1.1% sulphur are also available. How many tons of each of the later two samples should be mixed with the original 10 ton to give 20 ton sample containing 1.7% sulphur? Q.9 NaBr used to produce AgBr for use in photography can itself be prepared as follows: Fe+Br2FeBr2 FeBr2+Br2Fe3Br8 Fe3Br8+Na2CO3NaBr +CO2+Fe3O4 How much Fe, in kg is consumed to produce 2.50 X 103 kg NaBr? Q.10 A mixture of Xe and F2 was heated and the white solid so formed reacted with H2 to give 81 ml of Xe at STP and HF. The HF formed required 68.43 ml of 0.3172 M NaOH for complete neutralization . Determine empirical formula of white solid.

ANSWERS Q.1. 7.88hr Q.2 Mo Q.3 0.727 kg impure NaCl Q.4 31.25 kg Q.5. 1.34X103g AgNO3 Q.6. 0.286 of CS2 Q.7. 49.12% Q.8 3.3 ton of 1.1% and 6.7 ton of 0.8% Q.9 509 Kg Fe Q.10. XeF6

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