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A certain superinsulation material having a thermal conductivity of 2 x 10^-4 W/m C is used to insulate a tank of liquid nitrogen that is maintained at -196 degrees celsius; 199 kJ is required to vaporize each kilogram mass of nitrogen at this temperature. Assuming that the tank is a sphere having an inner diameter of 0.52 m, estimate the amount of nitrogen vaporized per day for an insulation thickness of 2.5 cm and an ambient temperature of 21 degrees celsius. Assume that the outer temperature of the insulation is 21 degrees celsius.
the solubility of kcl in h2o 34.0 g kcl100 g h20 at the temperature of twenty degree celsius. a solution warm having
1) What volume (mL) of Hydrogen gas, saturated with water vapor, will be obtained from a 0.1138g sample of alloy which is 73.2 percent Al? (Pbar=754.3 torr, T=21.2deg C) Show your work. 2) What volume (in mL) will the dry hydrogen gas from questio..
What concentration of aqueous NaCl solution freezes at -15.2ºC? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m.
What is the molar solubility of SrSO4 in pure water at 25ºC?
How many kilograms of magnesium can be obtained from 5.96 km^3 of seawater if the initial Mg^2+ concentration is .19% by mass. Remember the density of seawater is 1.04 g/ml
One mole of oxygen molecules contains more independent units (O2) than one mole of oxygen atoms (O).
Magnesium is used in lightweight alloys for airplane bodies and other structures. The metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation
A student heated a 4.901 g sample of hydrated iron chloride. After heating, the anhydrous iron chloride has a mass of 3.010 g. Calculate the percentage by mass of water in the hydrated compound.
What happens to recrystallization if crystallization is accelerated by immediately placing the flask of hot solution from the gravity filtration into the ice-water bath
Calculate ?G° for the reaction of ammonia with fluorine. 2NH3(g) + 5F2(g) ? N2F4(g) + 6HF(g) Substance: NH3(g) F2(g) N2F4(g) HF(g) ?G° f (kJ/mol)
calculate how many moles of the product form when 0.040mol of K completely reacts. Assume that there is more than enough of the other reactant. 4K(s)+O2(g)?2K2O(s)
A 74.8 g sample of copper at 143.2°C is added to an insulated vessel containing 165 mL of glycerol, C3H8O3 (l) (d = 1.26 g/mL), at 24.8°C. The final temperature is 31.1°C. The specific heat of copper is 0.385 J g-1°C-1. What is the heat capacity o..
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