Calculate the mass in grams of a quantum dot consisting....?

Question

Very small crystals composed of 1000 to 100,000 atoms, called quantum dots, are being investigated for use in electronic devices.

(a) Calculate the mass in grams of a quantum dot consisting of 1.200 104 atoms of silicon.

(b) Assuming that the silicon in the dot has a density of 2.3 g/cm3, calculate its volume.

(c) Assuming that the dot has the shape of a cube, calculate the length of each edge of the cube.



help: aggradro's (sp?) number is 6.022 x 10^23

Answer 1

a) First calculate number of moles by dividing number of atoms by Avogadro's number. Now you can find mass in grams by multiplying the number of moles by the atomic mass of silicon.

b) d = m/V

c) cube root of b) above.