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The mass of a beaker is 7.839g. After 7.50 mL of hexane, C6H14, is pipetted into the beaker, the combined mass of the beaker and the heaxane sample is 12.806g. What is the measured density of hexane?
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3). How much limestone (in kg) is required to completely neutralize a 4.3 billion liter lake with a pH of 5.5?
What is the vapor pressure (in torr) above a solution prepared by mixing 47.89 g of water, H2O, with 47.65 g of ethanol, C2H5OH, at 63.50 °C?
Calculate the standard potential for this reaction. Normally, X is Fe. Here it is some unknown metal, allowing for somewhat random values for ΔGo.
Suppose you wanted to make a pH=4.25buffer. What would be the best acid/base system: acetic acid/acetate or lactic acid/lactate? THe Ka of lactic acid is 8.32x10(exponent -4). Throughly explain your reasoning.
A gas sample has an original volume of 650 ml when collected at 750 mm and 30°C. If a change is made in the gas temperature which causes the volume of the gas sample to become 800 ml at 1.00 atm, what is the new temperature
Hydrogen Sulfide gas has toxicity comparable to Hydrogen Cyanide, but because of its intense odor its presence is observed at concentrations well below toxic levels.
A 380. mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 630. mmHg. Calculate the moles of Ar present.
a sample of sodium hydrogencarbonate, NaHCO3 is contaminated with 5-10% NaCl. How should i carry out an experiment to determine the percentage purity of NaHCO3 ?
Two organic species are produced when 1,1-dimethylethylmagnesium bromide reacts with 1-pentyne (a) Draw the skeletal structure of the new Grignard produced
A sample of CuSO4+5H2O and an inert material was dried to constant mass by heating in a crucible. From the data below, what is the calculated percent CuSO4+5H2O in the Sample?
in the titration of 25.00ml of 0.100M CH3COOH, calculate the number of milliliters of 0.200 M NaOH that must be added to reach a pH of a)3.85, b) 5.25,
Methane and hydrogen sulfide form when 36g H2 reacts wih carbon disulfide, calculate the percent yield if the actual yield of CH4 is 69.8g.
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