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If it takes 526 J of energy to warm 7.40 grams of water by 17 degrees Celsius, how much energy would be needed to warm 7.40 grams of water by 55 degrees Celsius?
Calculate the temperature change in the water upon complete melting of the ice. Determine how much heat is absorbed by the melting ice and then use q =mC Delta T.
Ethylene glycol, antifreeze, has a density of 1.11 g/cm^3. What is the mass, in grams, of 410 mL of ethylene glycol?
a 0.5118 gram sample of CaCO3 is dissolved in 6 moles of HCL, and the resulting solution is diluted to 250.0 ml in a volumetric flask. How many moles of Ca2+ are in a 25.00 ml aliquot of the solutio
A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.33 moles of KOH into 800 mL of solution. What is the pH of this buffer? Ka = 5.9 × 10-6 for HA.
A certain monoprotic weak acid with Ka = 6.8 × 10-7 can be used in various industrial processes, but is no longer used in chemistry teaching labs because it tends to explode when it gets old.
A sealed flask contains 0.65 g of water at 28 ^circ {rm{C}}. The vapor pressure of water at this temperature is 28.36 {rm mmHg}.
A bright orange ceramic "Fiestaware" plate is found to have an activity of 12.49 disintegrations per second (Becquerels or Bq), due to the uranium-238 used in the pigment. The half life for decay of
What amount of energy is required to completely ionize 6.2 grams of carbon atoms in the gas phase (C(g)) if the ionization energy of C(g) is 1086 kJ/mole?
Find the velocity of an electron emitted by a metal whose threshold frequency is 2.15×1014 {rm s^{-1}} when it is exposed to visible light of wavelength 4.76×10-7 {rm m}.
For a solution having 1 x 10-3 equivalents/liter total alkalinity (contributions from HCO3-, CO32- and OH-) at [H+]=4.69 e-11, what is the percentage contribution to the alkalinity from CO32-?
First determine the number of moles of rm Na^+ using the given molarity and volume. Next, use the chemical formula to determine the number of moles of rm Na_3PO_4 needed. Finally, convert moles to g
A cylinder with a moveable piston contains 0.76 of gas and has a volume of 330. What will its volume be if an additional 0.27 of gas is added to the cylinder?
One mole of calcium carbonate reacts with ammonia to produce CaCN2 and liquid water. The reaction absorbs 90.1 kJ of heat. Calculate the Triangle H degree f for calcium cyanamide.
A mass of 47.5 g of H2O(s) at 273 K is dropped into 225 g of H2O(l) at 298 K in an insulated container at1 bar of pressure. Calculate the temperature of the system once equilibrium has been reached.
A certain monomer used in the production of polymers has one nitrogen atom and the mass composition 67.90% C, 5.70% H, and 26.40% N. Sketch the probable geometric structure of this molecule, labeli
The Ksp values for the chloride salts are 1.9 × 10-7, 1.6 × 10-10, and 2.0 × 10-13, respectively. Which compound will precipitate first?
The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of ace
The value of delta H for the reaction H2 (g) plus Br2 (g) yields 2HBr (g) is -72 kj. how many kj of heat are releasedwhen 1.0 mol of HBr is formed by this reaction.
A 280ml flask contains pure helium at a pressure of 754 torr . A second flask with a volume of 475ml contains pure argon at a pressure of 732 torr . If the two flasks are connected through a stopcoc
Draw out the complete coordination environment of each zinc ion in liver alcohol dehydrogenase (LADH), including all ligands and nearby co-factors, complete protein side chains and hydrogens. Be ca
Acetaminophen, a common aspirin substitute, has the formula C8H9NO2. Determine the number of molecules of acetaminophen in a 500.0 mg tablet.
A swimming pool measures 25 meters wide by 145 meters long by 1 meters deep. How many gallons of water are required to fill the pool?
A gas-filled balloon having a volume of 2.50 L at 1.2 bar and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are -23°
A sample consisting of various gases contains 3.8×10-6 mole fraction of radon. This gas at a total pressure of 31 atm is shaken with water at 30 C. Calculate the molar concentration of radon