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144. Solving a chemistry problem

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1.7. Find the specific surface area of coal used in modern pulverized fuel furnaces if it is known that coal dust is pre-sieved through a sieve with openings of 7.5 · 10–5 m. The density of coal is 1.8 · 103 kg / m3. Consider the system monodisperse. Give the answer in m – 1 and in m2 / kg.
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