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- An aluminum coffee mug has in inner diameter of 2.50 cm at room temperature (20.0° C). If someone accidentally leaves the cup on the stove burner its temperature could rise to 300° C. What would be the inner diameter then? (keep 4 significant figures in your answer) Linear coefficient of expansion for copper, Caluminum = 24 X 10-6/C° Area coefficient of expansion for copper, Yaluminum = 48 X 10-/C° Volume coefficient of expansion for copper, Baluminum = 72 X 106/C°2. List three sources of error that would account for the differencese between your values and the accepted value. Some of your focus should be on considering the head transfer should only have take place between the water and the unknown substance in the calorimeter.1) Determine the number of air particles in an empty 12 fl oz bottle (about 3.5*10^-4 m^3) at a pressure of 1.01*10^5 Pa and a temperature of 25 oC. 8.6*10^6 8.6*10^11 8.6*10^18 8.6*10^21 2)Determine the average speed of an air particle at 15 oC. The mass of one air particle is about 4.81*10^-26 kg. 489 m/s 45 m/s 5044 m/s 16 m/s
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- Calculate AH, AS, and AG at 298 K for the reaction below. Please take note of units. B2H6(g) 2BH3(g) B2H6(g) 2BH3(g) AH 35 (kJ/mol) 110.0 IS 232.0 (J/mol-K) 188.0 AHxn kJ J/mol·K AGrxn kJ 關 %3D4. Wind chill describes the additional cooling that occurs when skin is exposed to wind. The equation is W(v)=-0.17v³+18.4v²-584v-239 for 0 ≤ v ≤ 45, where v is the wind speed in metres per second. The units for W are megajoules per square metres per hour. Determine the speed of the wind that gives a minimum wind-chill factor.< 2:30 1 4 7 +/- The activation energy Ea for a particular reaction is 42.2 kJ/mol. How much faster is the reaction at 343 K than at 315 K? (R = 8.314 J/ mol. K) 2 5 8 Question 1 of 13 . 3 60 9 O Submit Tap here or pull up for additional resources XU x 100
- 4. GO A certain element has a mass per mole of 196.967 g/mol. What is the mass of a single atom in (a) atomic mass units and (b) kilograms? (c) How many moles of atoms are in a 285-g sample?1. Thermal equilibration in a two-level atomic system: purely radiative case. Suppose a collection of two-level atoms has a specified radiative decay rate Yrad, = and no nonradiative decay, Ynr 0. The atoms are pre-cooled to absolute zero for long enough to come into equilibrium with №₂ 0, and then are suddenly moved at t = 0 into an enclosure with walls held at a finite temperature Trad. Find formulas for the populations N₁(t) and N₂(t), and for the temperature Ta(t) of the collection of atoms for t > 0. =10. Suppose there are two identical gas cylinders. One contains the monatomic gas neon (Ne), and the other contains an equal mass of the monatomic gas radon (Rn). The pressures in the cylinders are the same, but the temperatures are different. Determine the ratio KENE KERN of the average kinetic energy of an atom of neon to the average kinetic energy of an atom of radon.