Question

Numbers 8 & 9 Please!

Consider a region of the atmosphere of volume 25 dm3, which at 20°C contains about 1.0 mol of molecules. Take the average molar mass of the molecules as 29 g mol1 and their average speed as about 400 m s1. Estimate the energy stored as molecular kinetic energy in this volume of air What is the minimum energy that a bird of mass 25 g must expend in order to reach a height of 50 5) 6) The potential energy of a charge Qi in the presence of another charge Q2 can be expressed in terms of the Coulomb potential, ф(phi): 7) Q2 4nEr The units of potential are joules per coulomb, J C-, so when o is multiplied by a charge in coulombs, the result is in joules. The combination joules per coulomb occurs widely and is called a volt (V), with 1 V 1J C1. Calculate the Coulomb potential due to the nuclei at a point in a LiH molecule located 200 pm from the Li nucleus and 150 pm from the H nucleus. (Hint: Use Q 8) +Ze, where Z is the atomic number and e is the elementary charge.) 9) Plot the Coulomb potential due to the nuclei at a point in a Na CI ion pair located on a line half 10) Determine the wavelength of the radiation used by an FM radio transmitter broadcasting at 92.0 11) Calculate is the energy of (a) a single photon and (b) 1.00 mol of photons of wavelength 670 nm way between the nuclei (the internuclear separation is 283 pm) as the point approaches frorm infinity and ends at the mid-point between the nuclei. MHz? 2) The composition of planetary atmospheres is determined partly determined by the speeds of the molecules of the constituent gases. In this case, the faster-moving molecules can reach escape velocity and leave the planet. Calculate the mean speed of (a) He atoms and (b) CH4 molecules (i) 77 K, (ii) 298 K, and (iii) 1000 K

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Answer 1