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Three compounds, hexane, heptane, and an unknown molecule were separated using gas chromatography. The adjusted retention times were 10.4 min for hexane, 12.3 min for heptane, and 11.6 min for the unknown. Calculate the retention index for the unknown.
NaOH is added to 625 mL of 0.250 M weak acid (Ka = 5.62 × 10-5). What is the pH of the resulting buffer?
Commercial concentrated aqueous ammonia is 28% NH3 by mass and has a density of 0.90 g/ml . What is molarity?
What is the density of a substance if a 2.50mL sample has a mass of 0.880g at room temperature? ( show calculations) What is the specific gravity of the substance?
A 10.9 g sample of a certain gas was introduced into a constant volume container at 21 C. if the container were heated to 161C, how many grams of gas must be vented from the container
A 530. g piece of copper tubing is heated to 92.0°C and placed in an insulated vessel containing 49.5 g of water at 39.5°C. Assuming no loss of water and heat capacity for the vessel of 10.0 J/K,
Complete and balance the equation for this reaction in basic solution. Phases are optional.
what mass of stomach acid will neturalise an antacid tablet containing 0.1g of magnesium hydrogen carbonate
Fission of one mole of U-235 releases 1.9 x 1010 kJ. Calculate the number of kg of coal needed to produce the same amount of energy as the fission of 1 kg of U-235 (235.05g/mol)
What is the most important type of intermolecular attractive force that operate in each
Electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. What is the kinetic energy of an electron
A mixture of ammonium chloride and sand is placed in an evaporating dish and massed at 56.246g. The mixture is heated, driving off the ammonium chloride and massed again
The osmotic pressure,pie , of a solution of glucose is 83.1atm . Find the molarity of the solution at 298k .
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