The diagram representing this scenario is shown below
From the information given,
Number of molecules in hydrogen, NH = 1
Number of molecules in oxygen, NO = 15.99
y = 0.1cos53
y = 0.06 nm
x = 0.1Sin53
x = 0.08 nm
r1 = xi + yj = 0.08i + 0.06j
r2 = = 0.08i - 0.06j
r3 = 0
rcm = 2miri/2mi = (m1r1 + m2r2 + m3r3)/(m1 + m2 + m3)
r = 1(0.06i + 0.08j + 0.06i - 0.08j)/2(1 + 1 + 15.99)
r = (6.7 x 10^-3i) nm
the center of mass of the molecule = (6.7 x 10^-3i) nm