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Calculate the concentration of a solution composed of 13.1 g od Ba(NO3)2 dissolved in 750 g of water.
How many liters of oxygen collected over H2O and measured at 27 degrees Celsius and 745.0 mm Hg can be prepared by decomposing 4.421 grams of gold (III) oxide?
What volume and amss of steam at 100 degrees C and 1.00 atm would release the same amount of energy during condensation at 100 cm3 of liquid water would release during freezing?
125 mL of rm H_2O is initially at room temperature (22.0rm{} ^{circ}C). A chilled steel rod at 2.0rm ^{circ}C is placed in the water. If the final temperature of the system is 21.5^{circ}C, what is
The enzyme, carbonic anhydrase, is a large zinc-containing protein with a molar mass of 3.00 × 104 g/mol. Zn is 0.218% by mass of the protein. How many zinc atoms does each carbonic anhydrase
Calculate the maximum mass of solid (undissolved) phenacetin that can be recovered when the cooled solution is filtered.
A stock solution is prepared by adding 10 mL of 2.5 M Ba(CN)2 to enough water to make 23 mL. What is the CN- concentration of 5 mL of the stock solution
Calculate the mass of water that must be added to 0.45 mol of glucose to make a solution of 15.0 percent by mass. the molar mass of glucose is 180 g/mol.
Draw the best Lewis structure for N2O by filling in the bonds, lone pairs, and formal charges.
A buffer solution was made using an unspecified amount of acetic acid and 0.30 mol of NaC2H3O2 in enough water to make 1.50 L of solution. Its pH was measured as 4.50 on a meter. How many moles of H
A chemical reaction is run in which 463 Joules of work is done by the system and the internal energy changes by -1027 Joules. Calculate the amount of heat transferred
A mixture of sand and iron pieces weighs 53.29 g. Using a magnet, the iron is removed and weighs 15.63 g. What is the percent composition of sand in the mixture?
what is the mole fraction of hydrogen in a gaseous mixture that consists of 8.00 g of hydrogen and 12.00 g of neon in a 3.5 liter container maintained at 35.20 degrees celsius?
Determine the average rate of change of B from t=0 s to t=232 s
A solution is prepared by adding 0.500 g of solid rm NaCl to 50.0 mL of 0.100 M rm {CaCl_2}. What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution
A sample of neon gas used in a neon sign occupies a volume of 1.70 L at a pressure of 580 torr. Calculate the volume of the gas if the pressure in the glass tube of the sign is 781 torr.
A sample of a gas at 0.91 atm occupies a volume of 374 mL. If the temperature remains constant, what will be the new pressure if the volume increases to 265 mL?
In addition to fossil fuel combustion, what other facet of modern industrial society contributes to the formation of acid rain?
A compound made up of only phosphorus and chlorine contains 77.45% chlorine by weight. What is the electron domain geometry of the central atom of this substance?
The double-replacement reaction between silver-nitrate and sodium bromide produces silver bromide, a component of photographic film.
The reaction of 1-bromopentane with sodium iodide to give 1-iodopropane is endothermic. Explain what strategry you would use to obtain a good yield of product from this reaction.
A solution has an H3O1+ concentration of 1.7 10-2 M. What is the hydroxide ion concentration?
Calculate the new volume of a 7.0Liter balloon if the pressure is reduced from 1.0 atmosphere to 0.80 atmosphere (assume the temperature remains constant).
An electron in the n=5 level of a hydrogen atom emits a photon wavelength 1282.17 nm. To what energy level does the electron move?