What Thickness (In Cm) Is the Silicon Block (Density =

question 20

Multiple Choice

What thickness (in cm) is the silicon block (density = 2.33 g/cm3) that is 2.87 cm wide and long necessary to react with 91.3 g of Cr₂O₃ by the reaction: 3 Si (s) + 2 Cr₂O₃ (s) → 3 SiO₂ (s) + 4 Cr (l) ?

• A) 2.05 cm
• B) 1.32 cm
• C) 3.08 cm
• D) 8.98 cm
• E) 3.79 cm

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