Sio2 + 4hf = sif4 + 2h2o, what mass of hf is necessary to produce 12.91g of the sif4?
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Ответ:
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
Ответ: