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प्रश्न
Mass of one atom of an element is 6.645 × 10−23 g. How many moles of element are there in 0.320 kg.
संख्यात्मक
उत्तर
Given: Mass of one atom = 6.645 × 10–23 g
∴ Mass of 1 mole of atom = 6.645 × 10–23 g × 6.022 × 1023
= 40 g
∴ Number of moles of element in 0.320 kg = `(1 "mole")/(40 "g") xx 0.320` kg
= `(1 "mol" xx 320 "g")/(40 "g")`
= 8 mol.
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पाठ 1: Basic Concepts of Chemistry and Chemical Calculations - Evaluation [पृष्ठ ३४]
