Concentration terms: molality, molarity, mole fraction, percentage
- Match List - I with List - IIList-I (Example): A. Humidity B. Alloys C. Amalgams D. SmokeList-II (Type of Solution): I. Solid in solid II. Liquid in gas III. Solid in gas IV. Liquid in solidChoose the correct answer from the options given below : Answer: 2. A-II, B-I, C-IV, D-III Key idea: name the dispersed substance and the medium for each example. Humidity: water droplets/vapour in... 1
- In one molal solution that contains 0.5 mole of a solute, there is Answer: 3. 500 g of solvent Key idea: molality = moles of solute per kg of solvent. 1\ m=0.5/w with w in kg gives w=0.5 kg =500 g of solvent... 1
- A mixture of N_2 and Ar gases in a cylinder contains 7 g of N_2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N_2 is :[Use atomic masses (in g mol^-1) : N = 14, Ar = 40] Answer: 3. 15 bar Partial pressure p_i=x_i P_total . Moles N₂=7/14=0.25 ; moles Ar =8/40=0.2 . x_(N_2)=0.25/0.45=5/9 . p_(N_2)=5/9×27=15 bar... 1
- Which of the following is dependent on temperature ? Answer: 1. Molarity Key idea: a concentration term that uses volume changes with temperature, because volume changes. Molarity = moles of so... 1