CHEM 1411 P05SP17 Chapter 2 t Counting Atoms using Avogadro\'s Number Master My

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CHEM 1411 P05SP17 Chapter 2 t Counting Atoms using Avogadro's Number Master My t Counting Atoms using Avogadro's Number Matter is made up atoms, but in a real chemistry lab, we measure substances in Therefore you need to sy be able to convert from grams to numbers of atoms, and vice versa. Assig Coun eTe Stud User Quartz, which contains one silicon atom and two oxygen atoms per formula uni used as a gemstone, as well as in pressure gauges, oscilators, resonators, wa manufacture of glass, paints, abrasives, and precision instruments such as wat Part A What is the chemical formula for quartz? Express your answer as a chemical formula. formula for quartz. SiO2 Submit Hints My Answers Give up Review Pat Correct Part B How many oxygen atoms are in 330gof quartz? number of O atoms Submit Hints My Answers Give Up Review Part

Explanation / Answer

Part B) Quartz is silica SiO2

moles of quartz = 3.30 g/60.1 g/mol

                          = 0.055 mol

1 mole of quartz has 2 moles of oxygen

So,

0.055 mol of quartz has = 2 x 0.055

                                       = 0.110 mols of oxygen in it

number of atoms of oxygen in quartz = 0.110 x 6.023 x 10^23 = 6.625 x 10^22 atoms

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