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Stoichiometry of single and sequential reactions

37 questions on Stoichiometry of single and sequential reactions from the Mole Concept chapter: 7 NEET level, 15 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

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In the reaction N2 + 3H2 -> 2NH3, how many moles of NH3 are formed from 6 mol of H2 with excess N2? NEET level
On strong heating, CaCO3 -> CaO + CO2. The mass of CaO obtained from 10 g of pure CaCO3 is (Ca = 40, C = 12, O = 16): NEET level
If 2 mol of H2 and 2 mol of O2 react as in 2H2 + O2 -> 2H2O, what mass of water is formed? (H = 1, O = 16) NEET level
Complete combustion of ethane follows 2C2H6 + 7O2 -> 4CO2 + 6H2O. The volume of CO2 at STP formed from 6.0 g of ethane is (C = 12, H = 1; 22.4 L mol^-1): JEE Main level
13 g of zinc is treated with 7.3 g of HCl according to Zn + 2HCl -> ZnCl2 + H2 (Zn = 65, H = 1, Cl = 35.5; 22.4 L mol^-1 at STP). The volume of H2 liberated at ... JEE Main level
5.4 g of aluminium reacts with excess chlorine, 2Al + 3Cl2 -> 2AlCl3, and 20.0 g of AlCl3 is actually isolated (Al = 27, Cl = 35.5). The percentage yield is: JEE Main level
Sulfuric acid is made from sulfur by the sequence S -> SO2 -> SO3 -> H2SO4. If the overall yield is 80%, the mass of H2SO4 obtainable from 16 g of sulfur is (H ... JEE Main level
Fe2O3 + 3CO -> 2Fe + 3CO2. When 32 g of Fe2O3 is heated with 8.4 g of CO, the mass of iron obtained is (Fe = 56, C = 12, O = 16): JEE Main level
2KClO3 arrow 2KCl + 3O2. A sample of 49.0 g of KClO3 is heated and 80% of it decomposes (K = 39, Cl = 35.5, O = 16; 22.4 L mol^-1 at STP). Find the volume of O2... JEE Main level
11.7 g of NaCl is mixed in solution with 10.2 g of AgNO3: NaCl + AgNO3 -> AgCl + NaNO3 (Na = 23, Cl = 35.5, Ag = 108, N = 14, O = 16). Find the mass of AgCl pre... JEE Main level
Propane burns as C3H8 + 5O2 -> 3CO2 + 4H2O. Air contains 21% O2 by volume. What volume of air at STP (in litres, nearest integer) is needed to burn 6.6 g of pro... JEE Main level
White phosphorus (P4) burns in excess oxygen to give P4O10, which is then treated with water: P4O10 + 6H2O -> 4H3PO4. Starting from 12.4 g of phosphorus and onl... JEE Advanced level
A 18.4 g mixture of CaCO3 and MgCO3 is heated strongly until both carbonates decompose completely to the oxide and CO2. The CO2 evolved measures 4.48 L at STP (... JEE Advanced level
20 mL of a gaseous hydrocarbon C_xH_y is burnt completely with 100 mL of O2 (excess). After cooling to the initial temperature (water condenses to liquid) the g... JEE Advanced level
A 60 g sample of pyrite ore is 80% FeS2 by mass (Fe = 56, S = 32, H = 1, O = 16). Roasting gives SO2 (all S converted), which is converted into H2SO4 via SO2 ->... JEE Advanced level
A mixture of 28 g of N2 and 8 g of H2 reacts in a closed vessel by N2 + 3H2 -> 2NH3 until 60% of the limiting reagent has been consumed (N = 14, H = 1). Which o... JEE Advanced level
5.4 g of Al reacts with 14.6 g of HCl according to 2Al + 6HCl -> 2AlCl3 + 3H2 (Al = 27, H = 1, Cl = 35.5; 22.4 L mol^-1 at STP). Which of the following statemen... JEE Advanced level
Calcium carbide reacts with water, CaC2 + 2H2O -> Ca(OH)2 + C2H2, and the acetylene is then burnt completely, 2C2H2 + 5O2 -> 4CO2 + 2H2O. Starting with 6.4 g of... JEE Advanced level
On heating, potassium permanganate decomposes as 2KMnO4 -> K2MnO4 + MnO2 + O2. A 31.6 g sample of KMnO4 is decomposed completely (K = 39, Mn = 55, O = 16; 22.4 ... JEE Advanced level
In N2 + 3H2 -> 2NH3, what mass of NH3 is formed from 14 g of N2 with excess H2? (N=14, H=1) NEET level
Calcium carbonate decomposes as CaCO3 -> CaO + CO2. The volume of CO2 at STP obtained from 25 g of CaCO3 (M = 100) is NEET level
Ethane burns as 2C2H6 + 7O2 -> 4CO2 + 6H2O. How many moles of O2 are needed to burn 2 mol of C2H6 completely? NEET level
For 2H2 + O2 -> 2H2O, 2 mol of H2 is mixed with 1.5 mol of O2 and the reaction goes to completion. The mass of water formed is (H=1, O=16) NEET level
The reaction 2Al + 6HCl -> 2AlCl3 + 3H2 is carried out with 5.4 g of Al and excess HCl (Al=27). The volume of H2 at STP is JEE Main level
On strongly heating 10 g of CaCO3 (M=100), 3.08 g of CO2 (M=44) was collected. The percentage yield of CO2 is JEE Main level
What mass of KClO3 must be decomposed by 2KClO3 -> 2KCl + 3O2 to obtain 6.72 L of O2 at STP? (K=39, Cl=35.5, O=16) JEE Main level
11.2 g of iron and 4.8 g of sulphur are heated together to form FeS (Fe + S -> FeS). The maximum mass of FeS formed is (Fe=56, S=32) JEE Main level
100 mL of a mixture of methane and ethane requires 260 mL of oxygen for complete combustion (all volumes at the same temperature and pressure). Find the volume ... JEE Main level
Sulphur is converted to sulphuric acid in three stages: S -> SO2 -> SO3 -> H2SO4. Starting from 16 g of sulphur (S=32) and an overall yield of 80%, find the mas... JEE Main level
3.4 g of NH3 (M=17) reacts completely with excess oxygen: 4NH3 + 5O2 -> 4NO + 6H2O (N=14, O=16, H=1). Which statements are correct? Use 22.4 L/mol at STP. JEE Main level
6.35 g of copper reacts with excess concentrated nitric acid: Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O. All the NO2 is then passed into water, where 3NO2 + H2O -> 2... JEE Advanced level
10.0 g of a mixture of Na2CO3 and NaHCO3 is heated strongly until the mass is constant; the loss in mass is 1.55 g. Only 2NaHCO3 -> Na2CO3 + CO2 + H2O occurs (N... JEE Advanced level
In the thermite reaction 2Al + Fe2O3 -> Al2O3 + 2Fe, 5.4 g of Al is heated with 12 g of Fe2O3 (Al=27, Fe=56, O=16) and the reaction goes to completion. What mas... JEE Advanced level
Aniline is made from benzene in two steps: C6H6 -> C6H5NO2 (80% yield) and C6H5NO2 -> C6H5NH2 (75% yield). Starting from 15.6 g of benzene (M=78), find the mass... JEE Advanced level
4.8 g of magnesium (Mg=24) is added to a solution containing 0.30 mol of HCl: Mg + 2HCl -> MgCl2 + H2. Which statements are correct? Use 22.4 L/mol at STP. JEE Advanced level
A mixture of 1.2 g of carbon and 1.6 g of sulphur is burnt completely in excess oxygen to give only CO2 and SO2 (C=12, S=32, O=16). Which statements are correct... JEE Advanced level
10.0 g of a brass sample (Zn + Cu) is treated with excess dilute HCl and 1.12 L of H2 at STP is evolved; copper does not react (Zn=65; Zn + 2HCl -> ZnCl2 + H2; ... JEE Advanced level