Center of Mass of a Water Molecule H2O - Vanderbilt University
Center of Mass of a Water Molecule H2O
1) A water molecule consists of a single oxygen atom (O) to which is attached two hydrogen atoms (H).
2) The H atoms are 105o apart from one another, and a distance d from the O atom, as in the figure, where d = 9.57 x 10-11 meters. (Masses: O = 16u, H = 1u)
3) Where is the center-of-mass located in a coordinate system whose origin is at the center of the O atom?
y
a) For the O atom (x0,y0) = (0,0)
b) For the top H atom (x1,y1) = (d*cos(105/2), d*sin(105/2))
d
c) For the low H atom (x2,y2) = (d*cos(105/2), -d*sin(105/2))
105o x
d
Xcm = (m0*x0 + m1*x1 +m2*x2)/(m0+m1+m2)
ycm = (m0*y0 + m1*y1 +m2*y2)/(m0+m1+m2)
Xcm = (16*0.0 + d*cos52.5 + d*cos52.5)/18 = 0.068d
ycm = (16*0.0 + d*sin52.5 - d*sin52.5)/18 = 0.0
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