How many oxygen atoms are in 2.10g of quartz?

NetherCraft 0

2 Answers

  • moles SiO2 = 2.10 g(1 mole SiO2)/(60.0843 g) = 0.0350 mol SiO2

    moles of O atoms = 0.0350 mol SiO2[(2 mol O atoms)/(1 mol SiO2)] = 0.0700 mol O atoms

    no. O atoms = (0.0700 mol O atoms)[6.022 x 10^23 atoms)/(1 mole O atoms) = 4.21 x 10^22 O atoms in 2.10 g of SiO2, where SiO2 is the same as quartz.

  • Quartz is SiO2

    To calculate the number of atoms:

    1) First calculate the moles of quartz (SiO2)

    moles = mass/ atomic mass = 2.1/ (28.1+16*2) = 2.1/60.1 = 0.035

    2) The calculate the moles of O atoms

    1 SiO2 -> 2 O so 0.035 *2 = 0.070 moles of O

    3) Convert moles to molecules using Avogadro’s number

    0.070 moles * 6.022 x10^23 = 0.421 * 10^23 or about 4.2 x 10^22 molecules of O

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