Respuesta :

To convert grams to moles you must divide by the molar mass of the molecule
SiO2 molar mass=60.083
210/60.083=3.495
This sample has 3.495 moles of SiO2

The number of moles of  210 gram sample of sand contains 3.5 moles of mole of SiO₂

Sand is composed of silicon dioxide (SiO₂).

Therefore, let's calculate the molecular mass of SiO₂ . Therefore,

Molecular mass of SiO₂

The molecular mass of the compound is the sum of the atomic mass of the compound.

  • SiO₂ = 32 + (16 × 2) = 28 + 32 = 60 g/mol

Therefore,

60 g  = 1 mole of SiO₂

210 g = ?

cross multiply

number of moles = 210 / 60

number of moles = 21 / 6

number of moles = 3.5 moles

learn more on moles here:https://brainly.com/question/4816100

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