The microstructure of a Pb-Sn alloy at 183°C (361.4°F) consists of a and B structures. If the composition of the alloy is 61.9 wt% Sn, what is the relative mass fraction of each phase? Composition (at% Sn) 20 40 60 80 100 327°C 600 300 Liquid 500 232°C a + L 200 B+L 400 183°C 18.3 61.9 97.8 berature (°C) perature (°F)
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- 2. A spherical balloon is made from a material whose mass is 3.30 kg. The thickness of the material is negligible compared to the 1.45 m radius of the balloon. The balloon is filled with helium (He) at a temperature of 295 K and just floats in air, neither rising nor falling. The density of the surrounding air is 1.19 kg/m3 and the molar mass of helium is 4.0026x10-3 kg/mol. Find the absolute pressure of the helium gas. Pa Q A 2 N I W S #3 X H ption command E D 69 + $ 4 C R F G Search or type URL % 5 V T G MacBook Pro . .... I command option { [ ? 1 = "1 F O } 1Average human body temperature is 37°C or 310 K what will happen to human life if the boiling point of oxygen was above 310 KThe molecular formula of aspartame, the artificial sweetener marketed as NutraSweet Ⓡ, is C14H18 N2O5. How many moles of aspartame are present in 4.50 mg of aspartame? Express your answer using three significant figures. | ΑΣΦ n= ? mol
- Mercury is the only metal that exists as a liquid (d=13.56 g/cm3) at room temperature. Find the number of moles in 15 mL of mercury.Determine the composition of the Liquid (wt% Sn) for a 40 wt% Sn, 60 wt% Pb alloy at 250°C.If a person has a dangerously high fever, submerging her in ice water is a bad idea, but an ice pack can help to quickly bring her body temperature down. How many grams of ice at 0°C will be melted in bringing down a 60 kg patient’s fever from 40°C to 39°C?
- 47. The figure shows a 50 kg lead cylindrical piston which floats on 0.68 mol of compressed air at 30°C. How far does the piston move if the temperature is increased to 300°C? 130 cm 250 cm 50 kg 1300 cm 120 cm 30°C 10 cmWhen a solid sample was heated, its temperature increased but it did not melt. What has happened to the average molecular kinetic energies of the atoms in the sample and why? A Kinetic energy remained the same because potential energy decreased B Kinetic energy remained the same because potential energy increased C Kinetic energy decreased because the temperature increased D Kinetic energy increased because the temperature increased A spoon, a fork, and a knife are stacked on top of each other overnight. The temperature of both the fork and spoon is 21°C the next morning. According to thermal equilibrium, what can be predicted about the temperature of the knife? A The temperature of the knife is also 21°C because equilibrium has been reached between all three objects. B The temperature of the knife could only be determined through measurement. C The temperature of the spoon and fork are both conducted to the knife giving it a resulting temperature of 42°C. D The temperature of the…
- In the figure, a copper bar is welded end to end with a brass bar. The cross-section area of both bars is 5.00 x 10-4 m². What is the temperature at the junction of the two rods? T = ? 100°C 78°C 22°C 68°C 50°C copper 10.0 cm k=385 W/mCo brass 10.0 cm k=109 W/mCo 0°CA silver teaspoon at temperature 7⁰C is placed in a cup of hot coffee at temperature 93⁰C. If the teaspoon has a mass of 32 g and the hot coffee has 90g of mass, determine the final temperature of the silver teaspoon?Ccoffee = 1 cal/g.KCsilver = 0.0558 cal/g.KA lead rod is 20 cm long at 15°C. Under the same conditions, a brass rod is 22 cm in length. At what temperature will the lengths of the two rods be the same? KLead= 29x10-6K-1 KBrass= 19x10-6K-1