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A piece of metal weighting 20.32 grams is added to a flask with a volume of 24.5 mL. It is found that 18.52 grams of water (d=0.9970 g/ml) must be added to fill the flask. What is the density of the metal?
consider a flask at 298 K with an air pressure of 738 mmHg to which some n-butanol is added. If the measured pressure after the addition is 745 mmHg, what is the vapor pressure of n-butanol at 298 K?
Calculate the molar solubility of Fe(OH)2 in a buffer solution where the pH has been fixed at the indicated values. Ksp = 7.9 x 10-16 , Ph=7.5
Calculate the density of N2 at STP, (a) using the ideal-gas law and (b) using the molar volume and molar mass of N2.
If a mixture of gases contained 78% nitrogen at a pressure of and 22% carbon dioxide at 345 torr, what is the total pressure of the system?
What combination of a molecular base (that is a neutral compound, not an ion!) and a salt of the conjugate acid of that molecular base should you select to prepare a buffer solution that would maintain a pH of 9.00? For full credit, explain
How much thermal energy transfer is required to vaporize 1.0 metric tone of ammonia?(1 metric ton = 10^3Kg). The delta H vaporization for ammonia is 25.1KJ/mol.
Determine hydroxyl and hydrogen ion concentration in this solution. (if Ka for ammonium ion = 5.0 x 10^-10.)
Determine the longest wavelenght of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1.76*10^3 kJ/mol.
In 0.1592 M solution, a weak acid, HA, is 7.11% ionized. Calculate the ionization constant for the weak acid.
in a laboratory, 6.82 g of Sr(NO3)2 is dissolved in enough water to form 0.500 L of solution. A0.100 L sample is withdrawn from this stock solution and titrated with 0.0245 M solution of Na2CrO4. What voume of Na2CrO4 solution is needed to precip..
A 285- flask contains pure helium at a pressure of 750 . A second flask with a volume of 470 contains pure argon at a pressure of 716 .If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of h..
An experiment shows that a 250mL gas sample has a mass of 0.434g at a pressure of 744mm Hg and a temperature of 27C. What is the molar mass of the gas?
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