Chapter 1 : Solution : - 1. Define Molarity and Molality, And Write it's Formula. ( 2M ) 2. Calculate molality(m) of KI solution. If the density of 20% (mass/mass) aqueous solubility of KI is 1.202 gm/l. When molar mass of potassium and iodine are 39 and 127 respectively. 3 . A) Define molal boiling point elevation constant . ( 1M ) B) why is it safe to inject 0.9% sodium chloride into a vein . ( 2M ) 4. 2.46 gm NaOH (Molar mass = 40) is dissolved in 100 cm3 water. Determine the Molarity of the solution. ( 2 M) Ans: Click for Answer 5. 2.91 gm glucose ( Molecular mass = 180 ) is dissolved in 30 gm water. Determine the mole fraction of glucose. ( 2M ) 6. Calculate Mole Fraction of ethylene glycol ( C2 H6 O2 ) if 20 % by mass of C2H6O2. is present in that solution. ( 3M)...
Chapter 1 : Basic Concepts of Chemistry :- 1. Calculate mass in grams of a) An atom of Sulphur. b) A molecule of H2O . 2. How are 0.50 mol Na2CO3 and 0.50 M Na2CO3 different. 3. What is law of multiple proportion ? 4. Calculate the molecular formula of an oxide of Fe contain 69.9g and 30.1g of Fe and O respectively in percentage mass. ( Molar mass of oxide = 159.8 g/mol and Fe = 55.85 , O = 16.00 ) 5. What Will be mass of 01 Mole NaCl and 02 Mole of H²O. 6. Law of Definite Proportion. 7. What is average atomic Mass and atomic Mass Unit . Explain Avagadro number. 8. In three moles of ethane ( C2 H6) . Calculate number of moles of carbon atoms and hydrogen atoms . 9. Calculate the molecular formula of an oxide of iron contains 69.9 g and 30.1 gram of fe and o respectively in mass percentage. ( Molar mass of Oxide = 159.8g/mol and Atomic mass Fe = 55.8 and O...
Here's how to determine the molarity of the solution step-by-step: 1. **Calculate the number of moles of NaOH:** * Given mass of NaOH = 2.46 g * Molar mass of NaOH = 40 g/mol * Number of moles = Mass / Molar mass * Number of moles = 2.46 g / 40 g/mol = 0.0615 mol 2. **Convert the volume of the solution from cm³ to Liters:** * Given volume = 100 cm³ * Since 1 cm³ = 1 mL, the volume is 100 mL. * To convert mL to Liters, divide by 1000: 100 mL / 1000 = 0.1 L 3. **Calculate the Molarity of the solution:** * Molarity (M) = Moles of solute / Volume of solution in Liters * Molarity = 0.0615 mol / 0.1 L * Molarity = 0.615 mol/L Therefore, the molarity of the solution is **0.615 M**.
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