Given: sio2 + 4hf → sif4 + 2h2oin this chemical reaction, how many grams of hf are needed for 182 grams of sio2 to react completely? express your answer to three significant figures

242 gram of HF will be required for complete rex.

Balance chemical equation:

                                SiO2 + 4HF → SiF4 + 2H2O

Data given

                                mass of SiO2 = 182g

                                molar mass of SiO2=60.08

                                moles of SiO2 = mass/molar mass = 182/60.08 =3.02 moles

From balance chemcial equation

                                     SiO2 :  HF

                                         1    :     4

                                   3.02 =  4 × 3.02 = 12

mass of HF= no. of moles × molar mass

 mass of HF   = 12.08×20 = 242 g

the dissolution of polymer can be thermodynamically described in 2 steps.