The above reaction was used to fuel the rockets in the Apollo mission landing module.

A) Is this reaction endothermic or exothermic?

B) How many grams of N2H4 must be reacted with an excess of N2O4 to produce 775 kJ of energy?

C) How many kJ of energy are produced when 6.25 g of N2O4 reacts with an excess of N2H4?

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?