(a)
Interpretation: A chemical formula needs to be assigned to the compound in the cell.
Concept Introduction: According to the law of combining volume, the ratio of the volumes of pair of gases in a reaction at same temperature and pressure is the ratio of simple integers.
For example, 2 volume of H and 1 volume of O give 1 volume of water that is H2O.
Also, according to the Avogadro’s hypothesis, equal volume of different gases at same T and P has equal number of particles.
(b)
Interpretation: The reason for more than 1 formula possible in the answer to part (a) needs to be explained.
Concept Introduction: According to law of multiple compositions, two atoms of different elements can combine in more than one proportion to form different compounds.
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PRINCIPLES OF MODERN CHEMISTRY-OWLV2
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- The electrolysis of an aqueous solution of potassium iodide, KI, results in the formation of hydrogen gas at the cathode and iodine at the anode. A sample of 80.0 mL of a 0.150 molar solution of KI was electrolyzed for 3.00 minutes, using a constant current. At the end of this time, the I2 produced was titrated against a 0.225 molar solution of sodium thiosulfate, which reacts with iodine according to the equation below. The end point of the titration was reached when 37.3 mL of the Na2S2O3 solution had been added. I2 + 2S2O3(2-) = 2I(-) +S4O6(-2) a. how many moles of I2 was produced during the electrolysis b. The hydrogen gas produced at the cathode during the electrolysis was collected over water at 25 Celcius at a total pressure of 752 mmHg. Determine the volume of hydrogen collected (the vapor pressure of water at 25 Celcius is 24 mmHg) c. Write the equation for the half-reaction that occurs at the anode during the electrolysisarrow_forwardWhat is understood by a normal hydrogen electrode? Give its significance.arrow_forwardAn aqueous solution of copper sulphate, CuS04 was electrolysed between platinum electrodes using a current of 0.1287 ampere for 50 minutes. [Atomic mass of Cu = 63.5 g mol-1](a) Write the cathodic reaction.(b) Calculate:(i) Electric charge passed during electrolysis (ii) Mass of copper deposited at the cathode [Given: 1F = 96,500 C mol-1]arrow_forward
- • Calculate the activity of water at 1 atm, if a solution of 0.5 M KNO3 has a vapor pressure of 99.95 kPa.arrow_forward(b) A constant current was passed through a solution of AuCl; between gold (Au) electrodes. After a period of 20 min, the cathode increased weight by 2.628g. What was the current in amperes used?arrow_forwardA solution of nickel(II) ion (Ni2+) is electrolyzed using a current of 15.0 A (amperes) for 25.0 minutes. How many grams of nickel is produced, and on which electrode is the nickel deposited? (Atomic mass of nickel = 58.69 g/mol; Faraday’s constant, F = 96 500 C/mol-e–) (A) 13.7 g; at the cathode (B) 6.84 g; at the cathode (C) 0.228 g; at the anode (D) 13.7 g; at the anodearrow_forward
- What mass of rhodium (Rh) metal will be deposited from a solution of Rh3+ ions by running electrical current through the solution at 0.500 A for 120.0 minutes?arrow_forwardWhat volume of chlorine gas at standard temperature and pressure is evolved when a solution of MgCl2 is electrolyzed using a current of 12.4 A for 1.0 h?arrow_forwardWhat mass of gold can be plated onto an object in 9.18 minutes at 4.91 A of current ? Au^3^+ (Aq)+3e- ——>Au(s)arrow_forward
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