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When fully inflated, a hot-air balloon has a volume of 1.6 x 10^5 at an average temperature of 397K and 0.985 atm.Assuming that air has an average molar mass of 29g/mol , what is the density of the air in the hot-air balloon and is it less dense or more dense with the density of air at STP?
An acid, HA, has the following thermodynamic values for its dissociation in water at 27 degrees celcius: ΔH=-8.0 kJ mol-1; ΔS=-70 J K -1 mol -1
A balloon containing 4.28 L of an unknown gas at 1.00 atm and 298 K has a mass of 16.90 g. The empty balloon has a mass of 2.24 g. What is the molar mass of the gas in the balloon
the compound L-erythrose 4-phosphate was dissolved in 20 mL of chloroform and the solution was placed in a cell with a 20.0 cm path length, an observed rotation of 100? was found. Calculate the specific rotation, [?]D for L-erythrose 4-phosphate? ..
what is the ph of a solution prepared by mixing 50.0ml of 0.125M KOH and 50.0 ml of 0.125M HCl
Find a) the average speed, b) the root-mean-square speed, and c) the most probable speed of these particles. Explain your results
What is the specific activity (in Bq/g) if 3.76 kg of an isotope emits 3.77 * 10^7 beta- particles per minute
The following molecular equation represents the reaction that occurs when aqueous solutions of silver nitrate and calcium iodide are combined. 2 AgNO3(aq) + CaI2(aq) 2 AgI(s) + Ca(NO3)2(aq) Write the balanced net ionic equation for the reaction.
Given the following vapor pressures at 20 degrees Celsius, arrange the compounds in order of increasing boiling point: butane, 1,650 mm Hg; acetaldehyde, 740 mm Hg; Freon-113, 284 mm Hg.
calculate What mass of AlBr 3 is formed and calculate what mass of CCl 4 will be formed if 1.5 moles of CH 4 react with 1.4 moles of Cl?'
Draw all of the resonance forms of 4-methoxybenzaldehyde which contribute to the reducwd electrophilicity of the aldehyde carbon relative to benzaldehyde.
How many mL of a 22.5% (v/v) ethanol solution would you need to measure out in order to have 12.5 mL of ethanol? The Molar Mass of ethanol is 46.07g/mol.
If no heat is lost to the surroundings, what will be the final temperature of the mixture?
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