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How do you convert MOLES to MOLECULES? and MOLES to ATOMS?

Given the mass...how to find moles, molecules and atoms?

  • 4.37 g C6H6 = mass sample what is: moles of sample? molecules in sample? atoms in sample? okay, for the mole: 6(12.01)= 72.06 C 6(1.008)= 6.048 H =78.108g C6H6 (4.37 g)(1mol C6H6 / 78.108g C6H6) = .0559mol IS THAT RIGHT? Idk how to find molecules and atoms.

  • Answer:

    To find the amount of moles in your sample, you first add the atomic mass of all of the parts e.g. C=12.1grams/mole x 6 = 72.06 grams for 6 moles of carbon & H=1.008grams/molex6 = 6.048 = 72.06 + 6.048 = 78.106 grams/mole for C6H6. After finding the mass of your hydrocarbon would divide the mass of the sample by the mass for one mole which in your case is 0.0559 moles. After this to find the molecules in the sample you need to know Alvarado’s number which is 6.02x10^23 molecules per mole so multiple this by the amount of moles (0.0559). Then from the amount of molecules there are 12 atoms in C6H6.

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4.27 g C6H6; C6H6 = 78 g/mole A) MOLES 4.37 g C6H6 x (1 mole C6H6/ 78 g/mole ) = 0.056 MOLES B) MOLECULES [USE AVOGADRO'S NUMBER: 6.022 x 10^23 molecules/atoms PER mole substance] 0.056 moles x ( 6.022 x 10^23 molecules / mole) = 3.37 x 10^22 C) ATOMS SAME AS B. :)

kookiekim77

Moles = mass / molar mass Molar mass = ( 12 x 6) + ( 6 x 1) = 78 g/mol moles = 4.37g/ 78 g/mol = 0.0560 Molecules = moles x Avogadro's number = 0.0560 x 6.02 x 10^23 =3.37 x 10^22 Atoms = molecules x number of atoms in the molecule = 3.37x 10^22 x 12 = 4.05 x 10^23

Dr.A

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