Question

A silicon wafer with dimensions 15.00 cm x 15.00 cm x 0.0400 cm

Answer 1

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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