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What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.55 and has a freezing point of -2.0 °C. (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)
The density of an unknown gas is 4.00 grams per liter at 4.00 atmospheres pressure and 127 degrees C. What is the molecular weight of the gas?
how many grams of aspiring were lost in the washing process you used to purify the product, assuming you used 50 mL of water for washing? The solubility of aspiring in water is 0.33 grams per 100 mL at room temperature?
A sample of gas is collected over water at a temperature of 35.0C when the barometric pressure reading is 707 torr. What is the partial pressure of the dry gas, given PH2O = 42.2 torr?
A sample of 0.0020 mole of HCl is dissolved in water to make a 2000-mL solution. Calculate the molarity of the HCl solution, the [H3O+], and the pH. For a strong acid such as HCI, the [H3O+] is the same as the molarity of the HCl solution.
an Erienmeyer flask is closed by a stopper connected to a glass tube. the glass tube is sealed by a drop of mercury. if we move the whole appareatus in the diagram from a room with a temp. of of 26 degrees celcius to an outdoor yard with a temp of..
Calculate the pH of a solution containing 25.00 mL of 0.12M formic acid (Ka=1.7x10^-4) to which the following amounts of 0.10M NaOH have been added:
A Flask contains 0.320 mol of liquid bromine,Br_2. Determine the number of bromine molecules present in the flask.
2Na + 2H2O → + H2 How many moles of hydrogen gas are produced when 0.066 mole of sodium is completely reacted?
A graduated cylinder contains 145mL of water. A 10.0g piece of iron (density = 7.86g/cm3 ) and a 22.0g piece of lead are added.
How to Name and Define Acids, How can you know that HNO3 is nitric acid and HNO2 is nitrous acid? How do you know the difference in endings?
what is the theoretical yield of zinc iodide, if a 2.0-g sample of zinc was used with 6.5 grams of iodine
A 33.0 g sample of a nonelectrolyte was dissolved is 700. g of water. The solution's freezing point was -2.84°C.
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