2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) t
he δhf for fe2o3(s) = -824.3 kj/mole.
the δhf for al2o3(s) = -1675.7 kj/mole.
finish the equation.
δhrxn = [(1) ( kj/mole) + (2) ( kj/mole)] - [(1) ( kj/mole) + (2) ( kj/mole)]

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?