Calculate mass percentage of benzene and carbon tetrachloride

NCERT Chemistry Class 12 Chapter 2 Intext Solutions NCERT Intext Questions Chapter – Solutions Que 1. Calculate the mass percentage of benzene (C 6H 6) and carbon tetrachloride (CCI 4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride. Ans 1. Mass of solution = Mass of Benzene (C 6H 6) + Mass of Carbon Tetrachloride (CCl 4) = 22 g +122 g = 144 g Mass percentage of Benzene = 22/144 × 100 =15.28 % Mass % of CCl 4 = 122/144 × 100 = 84.72 % Que 2. Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride. Ans 2. Let the mass of Solution = 100 g ∴ Mass of Benzene in the solution = 30 g ∴ Mass of Carbon Tetrachloride = 100 – 30g = 70g Molar mass of Benzene (C 6H 6) = 78 g mol -1 Molar mass of CCl 4 = 12 + 4 × 35.5 = 154 g mol -1 ∴ No. of moles of benzene = 30/78 mol = = 0.3846 mol Molar mass of CCl 4 = 1 × 12 + 4 × 35.5 = 154 g/mol Therefore, Number of moles of CCl 4 = 70/154 = 0.4545 mol Thus, the mole fraction of C 6H 6 is given as NCERT Chemistry Class 12 Chapter 2 Intext Solutions Que 3. Calculate the molarity of each of the following solutions (a) 30 g of Co(NO 3) 26H 2O in 4·3 L of solution (b) 30 mL of 0-5 M H 2SO 4 diluted to 500 mL. Ans 3. We know that, Molarity = (a) Molar mass of Co(NO) 3.6H 2O = 59 + 2 (14 + 3 × 16) + 6 × 18 = 291 g/mol Therefore, Moles of Co(NO) 3.6H 2O = 30/291 mol = 0.103 mol Therefore, Molarity = 0.1o3/4.3 mol/lt = 0.023 M (b) Number of moles present in 1000 mL of 0.5 M H 2SO 4 = 0.5 mol Ther...

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Step 1: Molar mass: • The mass of 1 mole of a substance is called its molar mass. Step 2: Formula for molar mass • Molar mass = The atomic mass of element × number of atoms given in subscript Step 3: Calculation of Molar mass of Carbon tetrachloride CCl 4 : Molar mass of CCl 4 = Atomic mass of C + Atomic mass of Cl Molar mass of CCl 4 = 12 . 01 g mol - 1 + 4 × 35 . 45 g mol - 1 Molar mass of CCl 4 = 12 . 01 g mol - 1 + 141 . 8 g mol - 1 = 153 . 81 g mol - 1 Thus, the molar mass of carbon tetrachloride is 153 . 81 g mol - 1 .