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What are the molality and mole fraction of solute in a 29.3 percent by mass aqueous solution of formic acid (CH3OH)?
How many moles of HF (Ka = 6.8 10-4) must be present in 0.165 L to form a solution with a pH of 2.25?
A quantity of N2 is kept in a 12.8 L contianer at a temperature of 42 C and at pressure of 4.7 atm. how many grams of N2 are in the container?
calculate the number of microstates, W, that have this energy. Make sketches of these microstates. Calculate the corresponding entropy for each state.
In the early days of the periodic table, the 1870s, both silicon and tin were known elements, but germanium was unknown. Using these trends and the densities of silicon and tin that you just obtained, estimate the density of germanium?
Calculate [H+] and the pH of the following solutions
A gas mixture contains 1.25 g N2 and 0.85 g O2 in a 1.55-L container at 18 °C. Calculate the mole fraction and partial pressure of each component in the gas mixture.
Calculate the heat evolved from a mixture of 14.6 L of sulfur dioxide at 1 atm and 294 K and 15 g of oxygen if the following reaction occurs: 2 SO2(g) + O2(g) ?? 2 SO3(g) ?H? = ?198 kJ
In an experiment you combine 4-methyl-2-pentene and water, in the lab you setup the experiment using a a heater, condenser and N2 gas and add the reagent H2SO4
In the combustion reaction of 149 g of propane with excess oxygen, what volume of carbon dioxide if produced at STP?
total of 2.00 moles of a compound is allowed to react in a foam coffee cup that contains 122 gm of water. The reaction caused the temperature of the water to rise from 21.0 to 24.7
When 4 g sample of NH4NO3(s) was dissolved in 60 g of water in a coffee-cup calorimeter, the temperature drops from 296 to 291 K.
What is the concentration of a solution formed by diluting 25.0 mL of a 3.2 M NaCl solution to 135.0 mL.
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