Use the following formula for the volume:
V = w*l*h
where,
w: width of the chip = 3.5*10^-7 m
l: length of the chip = 1.8*10^-8 m
h: height of the chip = 6.45*10^-5 m
Replace the previous values of the parameters into the formula for V and simplify (consider to multiply coeeficients and then exponential factors):
Hence, the volume of the chip is approximately 4.1*10^-19 m^3