timmclark timmclark

10-10-2019
Chemistry

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SiO2 + 4HF = SiF4 + 2H2O, what mass of HF is necessary to produce 12.91g of the SiF4?

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gbustamantegarcia054 gbustamantegarcia054

11-10-2019

Answer:

mass HF = 9.928 g

Explanation:

SiO2 + 4HF = SiF4 + 2H2O

∴ Mw SiO4 = 104.0791 g/mol

∴ Mw HF = 20.01 g/mol

⇒ mol HF = 12.91 gSiF4 * (mol SiF4 / 104.0791 g) * (4 mol HF / mol SIF4) = 0.496 mol

⇒ mass HF = 0.496 mol HF * ( 20.01 g HF / mol HF ) = 9.928 g HF

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