What is the de Broglie wavelength of an oxygen molecule, O2, traveling at 285 m/s? Give answer in pm. Do not enter unit.

I used the equation lambda = (h/(mv)) using 0.032 kg for m, 285 m/s for v and 6.63 x 10^-34 for h. I get lambda to be 7.27 x 10^-35 m and then divide by 1 x 10^-9 to convert to picometers. Anyone know what I am doing wrong?

Light with a wavelength of 411 nm fell on a strontium surface, and electrons were ejected. If the speed of an ejected electron is 3.26×105 m/s, what energy was expended in removing the electron from the metal? Express the answer in joules (per electron). Do not enter unit.

I tried to mix a few of the equations given: E = hf, c = lambda*f, and lambda = (h/(mv)) but all of the variables of the last equation are known and the equation is not true. I used lambda = 411 x 10^-9, h = 6.63 x 10^-34, m = 9.1 x 10^-31 and v = 3.26 x 10^5. Anyone know what I am doing wrong?