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(i) A black dot used as a full stop at the end of a sentence has a mass of about one attogram. Assuming that the dot is made up of carbon, calculate the approximate number of carbon atoms present in the dot.(ii) What is the different between empirical formula and molecular formula? |
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Answer» (i) Number of particles in a mole = 6.022 × 1023 1 attogram = 10–18g Number of carbon atom = 1 Atomic mass of carbon = 12 \(\because\) 12 g of carbon contain = 1 × 6.022 × 1023 carbon atoms \(\therefore\) 10–18 g of carbon contains = \(\frac{1\times6.022\times10^{23}\times10^{-18}}{12}\) = 5.02 x 104 carbon atoms (ii)
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