type the correct answer in the box. given: sio2 + 4hf → sif4 + 2h2o in this chemical reaction, how many…

type the correct answer in the box. given: sio2 + 4hf → sif4 + 2h2o in 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. the reaction requires grams of hf.

type the correct answer in the box. given: sio2 + 4hf → sif4 + 2h2o in 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. the reaction requires grams of hf.

Answer

Explanation:

Step1: Calculate molar mass of SiO₂

The molar mass of Si is approximately 28.09 g/mol and of O is approximately 16.00 g/mol. So, molar mass of SiO₂ = 28.09+2×16.00 = 60.09 g/mol.

Step2: Calculate moles of SiO₂

Moles of SiO₂ = $\frac{mass}{molar\ mass}=\frac{182\ g}{60.09\ g/mol}\approx 3.03\ mol$.

Step3: Determine mole - ratio of HF to SiO₂

From the balanced chemical equation SiO₂ + 4HF → SiF₄ + 2H₂O, the mole - ratio of HF to SiO₂ is 4:1.

Step4: Calculate moles of HF

Moles of HF = 4×moles of SiO₂ = 4×3.03 mol = 12.12 mol.

Step5: Calculate mass of HF

The molar mass of HF is 1.01 + 19.00= 20.01 g/mol. Mass of HF = moles×molar mass = 12.12 mol×20.01 g/mol ≈ 242 g.

Answer:

242