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Class 12 Tuition > Learn NCERT Exercise 2 > Two elements A and B form compounds having formula...
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Two elements A and B form compounds having formula AB2 and AB4. When dissolved in 20 g of benzene (C6H6), 1 g of AB2 lowers the freezing point by 2.3 Kwhereas 1.0 g of AB4 lowers it by 1.3 K. The molar depression constant for benzene is 5.1 Kkg mol−1. Calculate atomic masses of A and B.

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We know that, Then, = 110.87 g mol−1 = 196.15 g mol−1 Now, we have the molar masses of AB2 and AB4 as 110.87 g mol−1 and 196.15 g mol−1 respectively. Let the atomic masses of A and B be x and y respectively. Now, we can write: Subtracting equation (i) from (ii), we have 2y...
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We know that, Then, = 110.87 g mol−1 = 196.15 g mol−1 Now, we have the molar masses of AB2 and AB4 as 110.87 g mol−1 and 196.15 g mol−1 respectively. Let the atomic masses of A and B be x and y respectively. Now, we can write: Subtracting equation (i) from (ii), we have 2y = 85.28 ⇒ y = 42.64 Putting the value of ‘y’ in equation (1), we have x + 2 × 42.64 = 110.87 ⇒ x = 25.59 Hence, the atomic masses of A and B are 25.59 u and 42.64 u respectively. read less
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