Question

Sand (silicon dioxide) and coke (carbon) are combined to form silicon carbide (SiC), a compound used in high-strength ceramic materials. What mass of silicon carbide will be produced from the reaction of 352 g silicon dioxide?

Answer 1

Answer:

Mass = 235 g

Explanation:

Given data:

Mass of SiO₂ react = 352 g

Mass of silicon carbide formed = ?

Solution:

Chemical equation:

SiO₂ + 3C    →     SiC + 2CO

Number of moles of SiO₂:

Number of moles = mass/ molar mass

Number of moles = 352 g/ 60.08 g/mol

Number of moles = 5.86 mol

Now we will compare the moles of SiO₂ with SiC from balance chemical equation.

                    SiO₂          :            SiC

                      1               :             1

                    5.86           :          5.86

Mass of SiC:

Mass = number of moles × molar mass

Mass = 5.86 mol × 40.11 g

Mass = 235 g