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An aqueous solution of ethanol, C2H5OH, is 19.00% ethanol by mass and has a density of 0.9700 g mL-1. Calculate the molarity of the ethanol solution.
What is the literature value for the Ksp of potassium hydrogen tartrate in water at 10, 22.5, 35, 50 degrees?
At 25o C, the solubility of magnesium hydroxide Mg(OH)2 in water is 0.00429 grams per Liter. Calculate the Ksp for the compound.
A sugar-water mixture contains 45.8 g of sugar and 108.5 g of water. What is the percent by mass of sugar and the percent by mass of water in the solution?
if 1.205g of KHP required 25.25mL of NaOH solution for complete neutralization, what is the molarity of the NaOH sodium hydroxide solution?
Consider the reaction in which 410 g of Ca(NO3)2 react with just the right amount of lithium metal in a single replacement reaction. how many grams of each product can be produced?
The volume of a sample of ideal gas at 25 degrees celius is 372 mL. what will be the volume of the gas if it is heated at constant pressure to 50 degrees celius? what will the volume fo the gas be i
An experiment requires 45.8 g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder
Determine the solubility of N2 in water exposed to air at 25 C if the atmospheric pressure is 1.2 atm. Assume that the mole fraction of nitrogen is 0.78 in air and the Henry's law constant for nitr
A volume of 80.0 mL of a 0.520 it M rm HNO_3 solution is titrated with 0.590 it M rm KOH. Calculate the volume of rm KOH required to reach the equivalence point
A 9.775 g. gaseous mixture contains ethane (C2H6) and propane (C3H8). Complete combustion to form carbon dioxide and water requires 1.120 mol of oxygen. Calculate the mass percent of ethane in the o
A calibrated flask was filled to the 25 mL mark with ethyl alcohol. By weighing the flask before and after adding the ethyl alcohol, it was determined that the flask contained 19.7325 g of alcohol.
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.