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A 0.374g sample of a metallic element, M, is completely dissolved in 100ml of 0.500N sulfuric acid. The liberated hydrogen occupied a volume of 320ml when collected over water at 25 degrees celcius
Tablets of KI were distributed to people living around Chernobyl one week after the nuclear reactor explosion occurred, to help flush radioactive 131I isotope out of their bodies. 131I has a half-li
What is the first step in drawing the Lewis structure for a molecule or ion
If a 2.6 reaction vessel initially contains 725 of cyclopropane at 485 , how long will it take for the partial pressure of cylclopropane to drop to below 105 ?
A wastewater contains 8.1 mg/L phosphate ions and is treated with an 18 mg/L alum solution. Calculate the mass of inorganic sludge (aluminum precipitates) produced in one day in a plant treating 22
What total volume of gas measured at 29°C and 774 torr, is produced when 1.05 g of NaHCO3(s) is completely converted to Na2CO3(s)?
A gaseous mixture of O2 and Kr has a density of 1.102 g/L at 420 torr and 300. K. What is the mole percent O2 in the mixture?
A large flask with a volume of 936 mL is evacuated and found to have a mass of 134.66g. It is then filled to a pressure of 0.967atm at 31 degrees C with a gas of unknown molar mass and then reweighe
What are some of the advantages and disadvantages of this type of solar-thermal "power"?
Hydrogen peroxide usually comes commercially as a 30% (w/v) aqueous solution, with a density of 1.106 g/ml. calculate the volume of the 30% solution one would need to make 50 ml of 4.0 M H2O2 solut
What is the symbol equation for incomplete combustion of ethane and what is the symbol equation for the complete combustion of ethane?
Calculate the number of grams of propane (C3H8) required to heat all of the water in a 50-gallon hot-water tank from 23.4 degrees C to 65.0 degrees C if the water tank itself has a heat capacity of
At 30 km above the surface of the earth, the temperature is about 230. K, and the partial pressure of oxygen is about 1.0x10^-3 atm. Estimate the partial pressure of ozone in equilibrium with oxyge
A sample of sodium reacts completely with 0.213 of chlorine, forming 351 of sodium chloride. What mass of sodium reacted?
The recommended adult dose of Elixophyllin, a drug used to treat asthma, is 6 of body mass. Calculate the dose in milligrams for a 195 person.
Which anions generally form precipitates? What are exceptions? Which anions generally do not form precipitates? What are exceptions? which cations generally do not form precipitates?
Assuming the density of water is 1.00g/mL at ambient temperature, what is the exact volume (in mL) of teh 250-mL Erlenmeyer flask?
Write the formulas of all possible monobromination products.
One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bon
a shiny yellow solid forms and sinks to the bottom of the container. What will be the total mass of the container's content once the yellow solid has formed? Explain your reasoning.
Hydrogen gas is produced when zinc reacts with sulfuric acid: If 164 of wet H2 is collected over water at 24C and a barometric pressure of 739 , how many grams of Zn have been consumed? (The v
If 100.0 mL of NO (at STP) reacts with 400.0 mL of O2 at STP, calculate the partial pressure of NO2 in the final reaction mixture.
Nicotine, a component of tobacco, is composed of C, H, and N. A 12.075 mg sample of nicotine was combusted, producing 32.757 mg of CO2 and 9.391 mg of H2O. What is the empirical formula for nicotine
converting liquid water to solid ice releases 1.44 kcal/mol. How many kilocalories are absorbed by melting 1 mol of ice?