7. A radioactive form of sodium pertechnetate is used as a brain-scanning agent in medical diagnosis. An analysis of a 0.9872 gram sample found 0.1220 grams of sodium and 0.5255 grams of technetium. The remainder is oxygen. Calculate the empirical formula of sodium pertechnetate. (Use the value of 98.91 as the atomic weight of Tc and arrange the atomic symbols in the formula in the order NaTcO.)

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Q: Complete the table. Element Mass Moles Number of Atoms Na 38.5 mg C 1.12 V 214 Hg 1.44 kg

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.