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Q: How many grams does 5.60 x 1022 molecules of SiO2?

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To find the mass, we divide by Avogadro's number to find the amount of moles. We then multiply the moles by the molar mass of the compound which is 60.08 grams. Doing all of this, we get a mass in grams of 5.59 grams.

The nitrogen iodide is NI3.

How many grams of nitrogen dioxide must react with water to produce 5.00 x 1022 molecules of nitrogen monoxide?

I think quartz is, SiO2, but if not the procedure here will remain the same. 2.20 grams SiO2 (60.09 grams/1 mole SiO2)(2 mole O/1 mole SiO2)(6.022 X 1023/1 mole O) = 4.41 X 1022 atoms of oxygen =======================

Using SiO2. 3.80 grams SiO2 (1 mole SiO2/60.09 grams)(2 mole O/1 mole SiO2)(6.022 X 1023/1 mole O) = 7.62 X 1022 atoms of oxygen --------------------------------------- Now, quartz shares oxygen and can be found as SiO4, so all you would do is change the molar mass.

1.64×1022 molecules

1 mole NCl3 = 120.366g NCl3 = 6.022 x 1023 molecules NCl3 8.2 x 1022 molecules NCl3 x 120.366g NCl3/6.022 x 1023 molecules NCl3 = 16g NCl3 rounded to 2 significant figures

Ans:Quartz is SiO2. It has a formula weight of 60.1 g/mol. 3 grams of SiO2 is 0.05 moles.Each mole of SiO2 has 0.1 moles of oxygen since there are 2 oxygen atoms per formula unit of SiO2.(1 mole of anything is 6.02x1023 of anything.)0.1 mol oxygen atoms x 6.02x1023 oxygen atoms / mol oxygen atoms= 6.02 x 1022 oxygen atoms.Number of O atoms =6.02×1022

1.20 × 1022 molecules

2.05×1022 molecules

The molecular weight of SiO2 is 64 grams per mole and 32 grams of them is oxygen. Therefore 1.00g of SiO2 contains 0.50g of oxygen.

147 (g) SiO2 / 60.1 (g/mol) = 2.446 mol SiO2(the molar mass of SiO2 is 60.1 g/mol)

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