the following are physics questions. I am not understanding these questions and appreciate your time and help in advance. thank you.

021 (part 1 of 2) 2.0 points A(n) 8.84 L vessel contains nitrogen gas at a temperature of 33.1GC and a pressure of 4.23 atrn. Boltzmann's constant is 1.38066 X 1023 J /K. 1What is the total kinetic energy of the gas? Answer in units of J. 022 (part 2 of 2) 2.0 points What is the average kinetic energy per parti- cle'? Answer in units of J. 023 (part 1 of 2) 2.0 points A nerve impulse is propagated across a synapse when the neurotransmitter acetyl- choline is released from the presynaptic mem- brane and diffuses across the 28 nm wide synaptic cleft to the postsynaptic membrane. How long does it take a nerve signal to cross a synapse? You can assume that the synap- tic uid is essentially water and the Diffusion coefficient is D = 4 X 1010 m2/s. Answer in units of s. 024 (part 2 of 2) 2.0 points What is the effective speed of transmission? Answer in units of m/s. 025 2.0 points The partial pressure of oxygen in the lungs is 150 mm Hg. This corresponds to a concentration of 5.3 X 1024 molecules13. In the oxygen-depleted blood entering the pulmonar capillaries, the concentration is 1.4 X 102 molecules13. The blood is sepa- rated from air in the alveoli of the lungs by a 2 pm thick membrane. What is the rate of transfer of oxygen to the blood through the 5 X 109 n12 surface area of one alveolus? The diusion coefcient for oxygen in tissue is 1.1 x 1011 mg/s. Answer in units of molecules / s