The silicon wafer contains 20.96 g of silicon.
The mole of a substance is related to its mass and molar mass by the following equation:
Mole = mass / molar mass ....... (1)
Making mass the subject of the above equation, we have
Mass = mole × molar mass ..... (2)
With the above formula (i.e equation 2), we can obtain the mass of silicon in the wafer as follow:
Mole silicon = 0.746 mole
Molar mass of silicon = 28.09 g/mol
Mass of silicon =?
Mass = mole × molar mass
Mass = 0.746 × 28.09
Mass of silicon = 20.96 g
Therefore, the mass of silicon in the wafer is 20.96 g
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