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In the emission spectrum of helium, there are strong lines at wavelengths of 447.1 nm, 501.6 nm, and 587.6 nm. Using the Balmer-Rydberg equation, determine the values of nf for each emission.
Oxygen difluoride, OF2, is a colorless, poisonous gas that reacts rapidly with water vapor to produce O2, HF, and heat. OF2(g) + H2O(g) --> 2HF(g) + O2(g) + 324.4 kJ
How many moles of stem are produced at 2.00 atm and 202.0 celcius by the complete combustion of 12.50 L of methane gas?
How many grams of sodium formate, NaCHO2, must be added to 750.0mL of .250 M of formic acid, HCHO2, to obtain a buffer with pH of 5.5 ?
A gas evolved during the fermentation of sugar was collected at 22.5 c and 702 mmhg. After purification it's volume was found to be 25.0 l . How many moles of gas were collected.
Draw every stereoisomer for 1-bromo-2-chloro-1,2-difluorocyclopentane. Use wedge-and-dash bonds for the substituent groups, and be sure that they are drawn on the outside of the ring, adjacent to each other
How much heat is produced in burning 5 mol of CH^4 under standard conditions if reactants and products are brought to 298 K and H20(l) is formed
Chemicals available for crystallization: ethyl ether, 95% ethanol, methanol, isopropyl alcohol, aceton, hexane, toluene and methylene chloride.
At 0.0 degrees C, if the volume of air is 2.5 mL and the pressure of the atmosphere that day is 805 mmHg, what is the number of moles of air.
1.00 moles of sucrose (C12H22O11), and 1.20 moles of glucose. Sucrose and glucose are nonvolatile. What is the mole fraction of water in this solution?
Phosphorus pentachloride is used in the industrial preparation of organic phosphorus compounds. Equation 1 shows its preparation from PCl3 and Cl2. (1) PCl3(l) + Cl2(g) PCl5(s)
Would there be any moisture diffusion in this system? In which direction? Using your sorption isotherm estimate the final moisture contents and water activities of each component?
A 14.5 gram sample of gas is found to have a volume of 2.8 liters at 275 K and 1.10 atm. What is the molar mass of this gas?
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