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A sodium hydroxide solution is standardized using 0.502g of solid oxalic acid, H2C2O4. Find the molarity of the base if 30.50 mL are required for the titration to a phenolphthalein endpoint.
The specific heat of iron is .443 J/g/K. What mass of steam at 100 degrees celcius must be converted to water at 100 degrees celcius to raise the temperature of a 150 g iron block from 25 degrees c
Two determinations of the dissolved oxygen content of a 200 mL sample of water made five days apart, gave 5.3 ppm and 2.2 ppm of dissolved O2, respectively. What is the biological oxygen demand o
An iron meteorite was analyzed for isotopic Argon Content. the amount of 36Ar was 0.200mm3 (STP)per kg of meteorite in each 36Ar atom had been formed by a single cosmic event, how many such events m
A 1.885g solid sample containing some FESO4 is dissolved in water. The resulting solution is acidified and titrated to the endpoint with 20.48 mL of 0.02540 M K2Cr2O7. What is the percent iron(II
Identify the element of lowest atomic number whose electron configuration contains four completely filled sublevels.
A 73.8 gram sample of CaSeO42H2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?
If your lab partner added slightly too much water in step 5 of preparing the penny solution. Will your final percentage of copper in the penny be too big, too small, or unchanged? clearly explain y
Oxygen reacts with CO to form CO2 as the only product. The proposed first step of the mechanism is: What second step is required to give a satisfactory mechanism?
A 325ml sample of gas is intially at a pressure of 721 torr and a temperature of 32 cecius. If this gas is compressed to a volume of 286 ml and the pressure increases to 901 torr, what will be the
What would the predicted temperature increase of a bomb calorimeter (heat capacity of 1450 J/C) that is submersed in 2.00 L of water (assume d(water) = 1.00 g/mL) be if 0.055 mol of a hydrocarbon (e
The precipitated AgCl was washed, collected, dried and found to have a mass of 1.10 grams. Calculate the percent chloride in the unknown.
Question: At a certain temperature the vapor pressure of pure benzene and pure toluene are 380 torr and 130 torr, respectively. If 7.97 mol benzene is mixed with 5.90 mol toluene, what is the total
A 35.0 mL sample of an unknown HClO4 solution requires 41.3 mL of 0.102 M NaOH for complete neutralization. What was the concentration of the unknown HClO4 solution? The neutralization reaction is:
Decomposition of KClO3 is sometimes used to prepare small amounts of O2 in the laboratory: 2KClO3(s) 2 KCl(s) + 3 O2(g). How many grams of O2 can be prepared from 4.50 g of KClO3?
List the following compounds in order of increasing lattice energy (from least negative to most negative): LiI, LiF, CaO, RbI.
The hydroxide reacts with the carbon dioxide to form solid lithium carbonate and liquid water. How many grams of carbon dioxide can be absorbed by 1.00g of lithium hydroxide?
Calculate the final temperature of a mixture of 110.0 g of ice initially at -10.5 degrees Celcius and 396.0 g of water initially at 93.5 degrees Celcius.
The designers have two options. one tanks is 42L in size and maintained at 25C while the other is 28L and help at 0.0C, both tanks are pressurized to 5.0 atm. How many grams of hydrogen can be store
A 0.421 g sample of aspirin prepared in the laboratory is dissolved in 95% ethanol, diluted with water, and titrated to a phenolphthalein endpoint with 17.3 mL of 0.114 M NaOH. What is the percent
Determined that the sodium hydroxide molarity was 0.1234 M, 0.1244 M, and 0.1199 M, respectively. Calculate the sample mean and the sample slandered deviation?
Barium reacts with a polyatomic ion to form a compound with the general formula Ba3(X)2. What would be the most likely formula for the compound formed between sodium and the polyatomic ion X?
What is the pH of a solution prepared by mixing 15.00 mL of a 0.3005 M solution of lactic acid with 15.00 mL of 0.1515 M NaOH? Ka for Lactic Acid= 1.4x10^-4
Two moles of gas A spontaneously convert to 3 moles of gas B in a container where the temperature and pressure are held constant. The sample originally took up 30.0L of volume. What is the new volum
A cylinder of compressed gas is labeIed "Composition (mole%) : 4.5% H2S, 3.0% CO2, 20% CO, Remaainder N2)." The pressure gauge attached to the cylinder reads 46 atm. Calculate the mole fraction and