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A mixture of sand and iron pieces weighs 53.29 g. Using a magnet, the iron is removed and weighs 15.63 g. What is the percent composition of sand in the mixture?
what is the mole fraction of hydrogen in a gaseous mixture that consists of 8.00 g of hydrogen and 12.00 g of neon in a 3.5 liter container maintained at 35.20 degrees celsius?
Determine the average rate of change of B from t=0 s to t=232 s
A solution is prepared by adding 0.500 g of solid rm NaCl to 50.0 mL of 0.100 M rm {CaCl_2}. What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution
A sample of neon gas used in a neon sign occupies a volume of 1.70 L at a pressure of 580 torr. Calculate the volume of the gas if the pressure in the glass tube of the sign is 781 torr.
A sample of a gas at 0.91 atm occupies a volume of 374 mL. If the temperature remains constant, what will be the new pressure if the volume increases to 265 mL?
In addition to fossil fuel combustion, what other facet of modern industrial society contributes to the formation of acid rain?
A compound made up of only phosphorus and chlorine contains 77.45% chlorine by weight. What is the electron domain geometry of the central atom of this substance?
The double-replacement reaction between silver-nitrate and sodium bromide produces silver bromide, a component of photographic film.
The reaction of 1-bromopentane with sodium iodide to give 1-iodopropane is endothermic. Explain what strategry you would use to obtain a good yield of product from this reaction.
A solution has an H3O1+ concentration of 1.7 10-2 M. What is the hydroxide ion concentration?
Calculate the new volume of a 7.0Liter balloon if the pressure is reduced from 1.0 atmosphere to 0.80 atmosphere (assume the temperature remains constant).
An electron in the n=5 level of a hydrogen atom emits a photon wavelength 1282.17 nm. To what energy level does the electron move?
744.5 g of a nonelectrolyte are completely dissolved in sufficient water to make 1.50 L of an aqueous solution at 25.0oC. The osmotic pressure of the solution is 59.9 atm. What is the molar mass of
Use the dipole moments of HCl and HF ( HCl = 1.08, HF = 1.82) together with the percent ionic character of each bond ( HCl = 20% ionic, HF = 45% ionic) to estimate the bond length in each molecule.
An aqueous solution is 22.0% by mass ethanol, CH3CH2OH, and has a density of 0.966 g/mL. What is molality of ethanol
What would you run as controls to be certain the ferric chloride test was working as predicted? What results would you expect for your control tubes?
An unidentified organic compound X, containing C,H, and O was subjected to combustion analysis. When 228.4 mg of pure X was burned 627.4 mg of CO2 and 171.2 mg of H2O were obtained. Determine the si
At room temperature however, aspirin is not soluble in this particular solvent but all the impurities remain soluble. Describe how to use this solvent to purify aspirin crystals away from the impuri
What is the pH at the point during a titration when 34 mL of 0.200 M HCl has been added to 33 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10-5 for NH3.
A 4.70 g nugget of pure gold absorbed 278 J of heat. The initial temperature was 28.0°C. What was the final temperature?
Calculate the heat that must be supplied to 10.8 g of Ne at .15 atm to raise its temperature from 28C to 51C at constant pressure. Assume that neon behaaves as an ideal gas.
When 25.0g os H2O reacts with 65g of Fe, which is the limiting reactant? How much excess reactant is used when the reaction is completed? What mass in grams of black iron oxide is produced?
What is the boiling point of a mixture composed of 95.0 g HOCH2CH2OH (ethylene glycol) and 205 g H2O? The boiling point elevation constant for H2O is 0.512 °C/m.
A solution is prepared by adding 60.0 mL of 0.060 M HBr to 180.0 mL of 0.70 M HI. Calculate the concentrations of all species in this solution. HBr and HI are both considered strong acids.