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A 12.00 g sample of manganese is heated and allowed to react completely with the oxygen in the air to form an oxide having a mass of 18.99 g. What are the moles for each component? Also, what is the whole number ratio of manganese to oxygen.
When 350.0 mL of 0.45 M benzoic acid is titrated with 0.15 M NaOH, what is the pH of the solution after 200.0 mL of base has been added? The pKa for benzoic acid is 4.19
An emission line in the hydrogen spectrum appears in the infrared region at 956 nm. What transition produced this line? Clearly indicate both nf and ni.
The hydrogen gas generated is collected over water at 25.0°C. The volume of the gas is 535 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure of water at 25°C = 0.0313 atm.)
fluoride ions, calcium ions, and several other dissolved ions. The ions are evenly distributed throughout the water. Which term or terms could be used to describe this sample of tap water?
A coffee-cup calorimeter is calibrated by adding 1840 J of heat to the water in the calorimeter and measuring a 1.72C rise in temperature.
Include in your explanation from which C and in what form the H would have to leave: [H+, H(with one electron), H(with two electrons)].
Suppose that 0.82 g of water condenses on a 80.0 g block of iron that is initially at 24 C.If the heat released during condensation goes only to warming the iron block
Dissolving NH4NO3 in water is an endothermic process. In fact, this reaction is often used in cold packs sold at the drug store. When 23.8 g of NH4NO3 was rapidly dissolved in 79.5 mL of water in a coffee cup calorimeter,
Copper dissolves in nitric acid, producing copper (ll) nitrate. After reaction with sodium hydroxide and heating, copper nitrate changes to copper (ll) oxide. Calculate the percent yield of this process if 1.075 g of copper produced 1.075 g of cop..
determine the specific heat capacity of a metal that has a mas of 14 grams. As the metal cools from 400 degrees celcius to 200 degrees celcius, 364 joules of heat is released
what is the density of a sample of ammonia if the pressue is 705 mm Hg and the temperature is 63.0
electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C.
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