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1 mole of a substance has approximately 6.02 x 10^23 its particles.
8.1 moles of C9H20 has 8.1 x 6.02 x 10^23 = 4.8762 x 10^24 C9H20 molecules
There are 20 Hydrogen atoms in a molecule of C9H20.
Number of hydrogen atoms = 4.8762 x 10^24 x 20 = 9.7524 x 10^25
There are about 9.75 x 10^25 Hydrogen atoms
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