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Bronze is an alloy consisting of 88.0% copper and 12.0% tin. The density of copper is 9.28 g/mL and the density of tin is 7.48 g/mL. Calculate the approximate density of bronze.
Aspirin is produced in a student lab. One mole of salicylic acid (MM 138 g/mole) reacts with one mole of acetic anhydride. write a balanced chemical equation in word. How much is the percent yield?
What does it mean to say that a proton is hydrated, and how will the heat of hydration affect the measured heat flow for a neutralization reaction?
A sample of an unknown gas effuses in 11.0 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.56 min. What is the molar mass of the unknown gas.
Copper in an ore sample is at a concentration of about 3% wt/wt. how many samples should be analyzed to obtain a percent relative standard deviation of 5% in the analytical result at the 95% confide
An inert gas has a volume of 941 ml at temperature 28 oC and pressure 675 Torr. What volume does the gas occupy at standard ambient temperature and pressure (SATP)?
Determine how much heat is absorbed by the melting ice and then use to calculate the temperature change of the 322 of water.
an ideal gas with temperature independent Cp = (7/2)R at 15 degrees C and having initial volume 60 m^3 is heated at constant pressure (P =0.1013 MPa) to 30 degrees by transfer of heat from a resivoi
A cook wants to heat 1.73 kg of water from 30.0C to 100.0C .If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas
A student placed 18.5 g of glucose C_6H_12 O_6 in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.mL mark on the neck
What is the molar solubility of Cu(OH)2 in the presence of 0.10 M oxalate ion? Report your answer to three significant figures.
determine the molar composition in percent of the mixture by assuming a linear relation between the refractive index and the molar composition of the mixture?
If one wanted to make 480g of H2O solution of K2CrO4, whose mass % is 6.2 % how many grams of K2CrO4 and how many grams of water should one use to prepare this solution.
63mL of a 1.70 M solution is diluted to a volume of 218 mL. A 109mL portion of the solution is diluted using 117mL of water. What is the final concentration?
A sample of oxygen that occupies 1.00 106 mL at 575 mm Hg is subjected to a pressure of 1.24 atm. What will the final volume of the sample be if the temperature is held constant?
The solubility of solid ZnCO3 is enhanced in acid, due to the reaction of carbonate with acid. What is the equilibrium constant for the reaction of solid ZnCO3 with acid?
The best explanation of boiling point elevation caused by dissolving sodium chloride in water is because
Twenty grams of liquid mercury at 98.0 °C is placed in 47.0 g of water initially at 25.0 °C. What is the final temperature of the water, assuming the styrofoam calorimeter absorbs no heat at
A 100.-L flask contains a mixture of methane (CH4) and argon at 25C. The mass of argon present is 228 g and the mole fraction of methane in the mixture is 0.650. Calculate the total kinetic energy o
Why can you make the assumption that all of the SCN- (reactant)ion in the solutions has been converted to FeNCS2+ ion?
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m. Assume the van't Hoff
one day you notice that the outside temperature increase by 16 degrees Fahrenheit between your early morning jog and your lunch at noon. what is the corresponding change in temperature in the Celsiu
How does an atomic absorption spectrometer find the concentration of a certain element in a sample? Please explain the step-by-step process in simple terms.
When ammonia is burned in oxygen, free nitrogen gas and water are produced. What volume of ammonia will react completely with 25.0 L of oxygen? what volume of nitrogen gas is formed.
A 5.0 dm3 sample of oxygen at a pressure of 200kPa and 2.0dm3 sample of nitrogen at a pressure of 500kPa are introduced into a 2.5dm3 vessel. What is the total pressure in the vessel?