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What is the molarity of the HCl solution if 270 mL of the HCl solution reacts with magnesium to produce 7.40 L of H_{2} gas measured at STP.
A copper wire (density = 8.96 g/cm3) has a diameter of 0.39 mm. If a sample of this copper wire has a mass of 43 g, how long is the wire?
Which radio station broadcasts at a longer wavelength: 93.9 FM or 104.3 FM? To support your answer, list the actual wavelength values and units for each of these radio stations.
Calculate the number of moles of the H2O2 in the 10.00 mL sample in every titration from the volume of KMnO4 used and the stoichiometry of the reaction.
Calculate the pH of a 0.50 M aqueous solution of NH3. The Kb for NH3 is 1.8 x 10-5.
what would happen to the molar mass of the solute if the thermometer used actually read 1.4 degrees Celsius too high?
An unknown acid has a molar mass of 90. g/mol and a mass composition of, 40%-C, 6.7%-H, and 53.3% -O. What is the molecular formula of the acid
Calculate the radius of the metal atom. A hypothetical metal has a face-centered cubic unit cell with the edge length of 4.943 Å.
Calculate the amount of heat required to completely sublime 51.0 g of solid dry ice (CO_2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol .
825grams of NO are produced from the reaction of 500grams of NH3 with excess oxygen, what is the percent yield?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 87.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
A balloon filled with helium gas has a volume of 500 mL at pressure of 1 atm. The balloon is released and reaches an altitude of 6.5 km, where the pressure is 0.5 atm.
The electrolysis of molten Al2O3 at 980 ºC is used to produce metallic aluminum. A current of 360 A is used in the electrolysis cell. What is the rate of formation of aluminum, in kilograms per hour?
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