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A mixture contains Al2O3(s) [MW = 101.96 g/mol and Fe2O2(s) [MW=159.69 g/mol] and weighs 1.9834g. When heated under excess hydrogen gas, the iron oxide reacts to form water vapor and Fe(s) but aluminum oxide remains unreacted. If the residue following heating weighs 1.6446g determine the wight percent of iron oxide in the original mixture.
The empirical formula of a compound is found to be P2O5. Experiments show that the molar mass of the compound is 560g/mol. What is the molecular formula of the compound?
An 11.0 gram sample of CO2 exerts a pressure of 50.0kPa. What mass of CH4 must be added to the CO2 in order to increase the pressure of 75.0 kPa? Assume no CO2 escapes.
what is the order of increasing stability: Li2,Li2+,Li2-?
calculate the molecular mass of a solute with 8.02 grams of solute in 861 grams of water lower the freezing point to -.430 degree Celsius
The temperature of a lead fishing weight rises from 15 oC to 45 oC as it absorbs 22.5 kJ of heat. What is the mass of the fishing weight in grams? Heat capacity of lead is 0.128 J/g oC.
A substance has a solubility of 350 ppm. How many grams of the substance are present in 1.0 L of a saturated solution.
what number of grams of NaHCO3 in a .210 g piece of antacid would generate 38.0 moles of CO2, if the CO2 is measured at 20 degrees C and 1.00 atm.
A student standardized her I2 solution by preparing a solution of 0.0450 g of ascorbic acid (vitamin C) in a 100 mL volumetric flask. She titrated several 10.00 mL samples of the Vitamin C solution
If 19.0 mL of 0.800 M HCl solution are needed to neutralize 5.00 rm mL of a household ammonia solution, what is the molar concentration of the ammonia?
Calculate the solubility of Ni(OH)2 in a) distilled water and b) at pH of 4.0. Justify your answer. I know I need to use a mass balance ans the reaction for disolution is
What is the concentration of free Ni2+ ions in a saturated Ni(OH)2 solution if the pH is buffered to remain at 8.4? The Ksp of Ni(OH)2 is 6.0 x 10^-16.
Consider a rigid, adiabatic, impermeable cylinder (i.e., a closed isolated system) that consists of two chambers (i.e., simple systems) that are separated by a wall that is permeable
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