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Mass of mineral sample = 0.123 g The Na2SO4 in the sample is converted to insoluble BaSO4. The mass of BaSO4 is 0.177 g What is the mass percent of Na2SO4 in the mineral?
imagine you are a water molecule, describe your travels through the many you have been and might go in the future as you make your way around the hydrologic cycle time after time. Include travels through organisms.
A 51.0-mL volume of AgNO3 solution contains 0.0273 mol AgNO3 (silver nitrate). What is the molarity of the solution.
The mass of the ice cube is 11.2 g, and its initial temperature is -12.8 °C. The water resulting from the melted ice reaches the temperature of your skin
A certain quantity of a gas occupies 61.3 mL at 68C. If the pressure remains constant, what would the volume of the gas be at 17C?
Determine the pH of a 0.62 M NH4NO3 solution at 25°C. The Kb for NH3 is 1.76 × 10-5.
Draw one energy diagram showing both reaction pathways & label all transition states, intermediates and products as well as activation energies.
The combustion of one mole of ethanol (C2H5OH(l)) to produce carbon dioxide and gaseous water has ?Hr = -1235 kJ · mol-1 at 298 K. What is the change in internal energy for this reaction?
If 85.0 of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m. ?
Calculate the pH at the equivalence point for the titration of a solution containing 1250.0 mg of hilariamine (MW = 104.75 g/mol, Kb = 7.1×10-4) with 0.1000MHCl solution.
How many moles of magnesium and moles of chlorine ions are present in 123.4 mL of a .345 M solution of magnesium chloride
A 39.0 mL solution of 0.500 M Cd(NO3)2 is prepared. What mass of NaOH is needed to precipitate the Cd2+ ions from this solution?
If a 190 mg piece of gold (density =19.32 g/cm^3) is hammered into a sheet measuring 2.1*1.0 ft, what is the average thickness of the sheet in meters?
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