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A flask contains 0.160 of liquid bromine, . Determine the number of bromine molecules present in the flask.
A graduated cylinder contains 154 of water. A 15.0 piece of iron (density = 7.86 ) and a 18.0 piece of lead are added. What is the new water level in the cylinder?
When 56.0 g calcium and 34.7 g nitrogen gas undergo a reaction that has a 88.0% yield, what mass of calcium nitride forms?
Compute the molar mass of vitamin C if a solution of 22.7 g in 100. g of water freezes at -2.40 oC. The Kf of water is 1.858 oC kg/mol.
The vapor pressure of chlorine dioxide (ClO2) is 155 Torr at -22.75 ? C and 485 Torr at 0?C. What is the normal boiling point of chlorine dioxide? The universal gas constant is 8.314 J . K·mo
The first ionization energy of bismuth is E_{rm i1} = +703 {rm kJ/mol}. What is the longest possible wavelength of light that could ionize an atom of bismuth?
A system absorbs 192 kj of heat and the surroundings do 110 kj of work on the system. what is the change in internal energy of the system?
A solution is prepared by mixing 55.0 mL of 0.015 M BaCl2 and 150. mL of 0.045 M K2SO4. What are the concentrations of barium and sulfate ions in this solution?
Calculate the theoretical yield of when 108 g of C2H5Cl reacts with 236 g of , assuming that and react only to form C2H5Cl and HCl
In photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen.
Calculate the amount of heat required to heat a 3.9 gold bar from 27 to 69
A very dilute solution contains 116 mg of fructose (M=180.16 g/mol) in 1.00 liters of solution. It is placed in a semipermeable membrane bladder, which is then suspended by a support in some pure wa
What is the expected freezing point of a 0.50 m solution of Li2SO4 in water? Kf for water is 1.86°C/m.
What is the main overall driving force for any spontaneous reaction or change?
How many grams of dry NH_4Cl need to be added to 1.60 L of a 0.800 it M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.99? Kb for ammonia is 1.8*10^{-5}.
Distinguish between an absorption spectrum and an emission spectrum. With which did Bohr work?
A graduated cylinder contains 129 of water. A 17.0 piece of iron (density = 7.86 ) and a 21.0 piece of lead are added. What is the new water level in the cylinder?
The ligand, hydrotris( 1-pyrazolyl)borate is commonly used in biomimetic complexes. Draw out the ligand. Why is this a useful ligand for bioinorganic model complexes?
Using the balanced reaction, enter the formula, charge(if any), and state of the species (exclude H2O) in solution if neither reactant is present in stoichiometric excess.
How many metric tons of 5%-S coal would be needed to yield the H2SO4 required to produce a 3.0-cm rainfall of pH 2.00 over an area of 100 square kilometers?
Calculate the mass of propylene glycol that must be added to 0.340 of water to reduce the vapor pressure by 2.86 at 40 ( at 40 ).
The water level in a graduated cylinder initially at 224 rises to 287 after a piece of lead is submerged. What is the mass in grams of the lead?
Is the solution saturated or unsaturated? what would happen if: (a) more KBr was added to the solution; (b) the tempurature was lowered to 0C?
A chemist prepares a solution by dissolving 2.228 g of NaNO3 in enough water to make 200 mL of solution. What molar concentration of sodium nitrate should appear on the label.
When separated from a water solution cuso4 forms a hydrate with 5 water molecules per formula unit. If 36 g of anhydrous cuso4 are dissolved in water, why mass of the hydrate could be recovered fro