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In what two instancescan a steam distillation be carried out by heating the substance to be purified with water in a simple distillation flask (generatingsteam in situ)?
When 154 g of water at a temperatureof 22.5°C is mixed with 65.1 g of water at an unknown temperature, the final temperature of the resulting mixture is42.6°C.
Calculate the fraction of lattice sites that are Schottky defects for cesium chloride at its melting temperature(645oC). Assume an energy for defect formation of 1.86eV.
Calculate the energy for vacancy formation in silver,given that the equilibrium number of vacancies at 800°C (1073K) is 3.6 x 10^23 m-3. The atomic weight and density (at800°C) for silver are
Potassium reacts with oxygen to make potassium oxide,K2O. What is the maximum mass (g) of K2O(s)that could be prepared from 8.24 g of K(s) and 2.64 g ofO2(g)?
What is the molar concentration of Cl- in a solution prepared by mixing 25.0 ml of 0.025 M NaCl with 35.0 mLof 0.05 m BaCl2 ? What is the pCl for the mixture?
The enthalpy of solution of KBr in water is about +198 kJ/mol.Nevertheless the solubility of KBr is water is relatively high. Why does the solution process occur even though it is endothermic?
A 4.476 g sample of a petroleumproduct was burnt in a tubefurnace, and the SO2 produced was collected in 3%H2O2. Reaction: SO2(g) +H2O2--> H2SO4.
A 0.6407 g sample containing chloride & iodine gave a silverhalide precipitate weighing 0.4430 g. This precipitate was thenstrongly heated in a steam of Cl2 gas to convert AgI toAgCl; upon
A 1.53 g sample of water is injected into an exacuated 5.00 L flask at 65 degrees celcius. What will the mass of water vapor be when the system reaches equilibrium?
A student weighs 0.2254 g of sodium chloride for chloride determination. Calculate the millimoles of silver nitrate required to precipitate the chloride.
AS we saw in Section 12-8 ,stacking spheres always leavesopen space .Consider the corresponding situation in two dimensions:Squares can be arranged to cover the area ,but circles cannot.
In acetic acid vapor ,some molecules exists as monomersand some as dimers( see figure 12-31 ).If the density of the vaporat 350 K amd 1 atm is 3.23 g/ L what percentage of the molecules must exist a
If the melting pointof ice decreases by 1.0 0C for every 125atm of pressure what would be the melting point of the ice under the skates?
Are the fullerenes network covalent solids? What makes them different from diamond and graphite ? It has been shown thatcarbon can form chains in which every other carbon atom is bonded to the next
The boiling point elevation of a solution consisting of 2.10 g of anonvolatile solute in 97.9 g of benzene is0.5671 oC. What is the molecular weight of the unknown solute?
The partial pressure of water above a solution of water and anonvolatile solute at 25oC is 19.9 mm Hg. What is themole fraction of the solute?
Calculate the minimum mass,in grams, of hydrogen gas that would have to be burned toform water vapor in order to provide the necessary work to produce188.0g of ethylene.
A 1.0000g sample of an unknown mixture containingCaCl2 is mixed with 1.0000g Na2CO3(excess) to form 0.4352g of CaCO3 ppt.How many moles of Ca were in the unknown mixture?
Using AMDAHL'S law, compute speedups for a program that is 98%vectorizable for a system for a system with 16,64,256 and 1024processors .
A student determines the molar mass of acetone CH3COCH3, by themethod used in this experiment. She found that theequilibrium temperature of a mixture of ice and water was 1.0degrees C on her thermom
What is the wavelength of light in centimeters having a frequencyof 1.5x10^18 s^-1? (The speed of light is 3.00 x 10^8 m/s)
Calculate the de Broglie wavelength of an electron accelerated from rest through a potential difference of (a) 100 V, (b) 1.0 kV, (c) 100 kV.
Explain how a sodium atom might end up with the exact same electron configuration as a neon atom?Nettie's answer: By losing or gaining electrons?
A 4.0 g sample of Colorado oil shaleis burned in a bomb calorimeter, which causes the temperature ofthe calorimeter to increase by 5.0 C. The calorimetercontains 1.00 kg of water (CH2O = 4.184 J/g C