a. volume of sphere = (4/3)*pi*r^3
You need the volume in cc; therefore, I would convert 4 nm to cm and go from there.(Note: 1 nm = 10^-9 m; 1 m = 100 cm) Then mass = volume x density. You will need to look up the density in your text or on-line.
b.
Use the same procedure as in a and convert 3.5 nm to grams. Then remembering that 1 mol Ge contains 6.02E23 atoms, calculate # atoms in the mass of Ge.
Please help in any way that you can.
Very small spherical crystals called quantum dots are being investigated for use in electronic
devices.
a. Calculate the mass of a quantum dot of pure silicon that has a diameter of 4nm.
b. If you made a 3.5nm diameter quantum dot of pure germanium, how many
germanium atoms would it contain?
3 answers
i got
A) 7.0*10^6
B) 2.4*10^6
is this right
A) 7.0*10^6
B) 2.4*10^6
is this right
If you will show your work I will look for the error(s). And what are the units.
1 answer