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a piece of gold jewelry that weighs 9.35 g and has a volume of 0.654 cm3. The density of pure gold is 19.3 g/cm3 and the density of pure silver is 10.5 g/cm3. Find the percent composition of gold and silver
A fluoridated water supply contains F- at a concentration of 8.9 ppm. What is the maximum concentration of Mg2+ that can exist in this water supply without causing precipitation.
determine how many grams of C 12 H 22 O 11 (sucrose) (mm = 342 g/mol) does he need if he uses 375 grams of Water? it is given that the vapor pressure of water =17.5 mm Hg. at 20 degree celsius temperature)
Give the reaction scheme, showing the products formed (before hydrolysis), when one equivalent of ethylmagnesium bromide is treated with one equivalent of 5-hydroxy-2-pentanone
Calculate the pH of a solution resulting from mixing together the following: a) 37ml of HCL 0.1M+33ml of NaOH 0.03M b) 55ml of HNO3 0,7M+88ml of KOH 0.8M c) 170 ml of H2SO4 0,44M_29ml of NaOH 1.2M d)76 liters of HBr 0.01M+2 liters of Mg(OH)2 2.1M.
When the sodium atom becomes a sodium ion, how does the size and electron configuration of the sodium atom change?
When 50.0 mL of water containing 0.50 mol HCl at 22.5°C is mixed with 50.0mL of water containing 0.50 mol NaOH at 22.5°C in a calorimeter, the temperature of the solution increases.
if 58.7L of H2 are collected over water at 20C and 758 torr, what is the mass percent yield? (vapor pressure of water at 20C is 17.5torr)
The density of liquid oxygen at its boiling point is 1.14kg/L , and its heat of vaporization is 213kJ/kg. How much energy in joules would be absorbed by 4.0 L of liquid oxygen as it vaporized.
A 6.50 x 10^-5 M solution of potassium permanganate has a percent transmittance of 27.3% when measured in a 1.15-cm cell at a wavelength of 525 nm.
sample containing 4.80 g O2 of gas has a volume of 15.0 L. Pressure and temperature remain constant. What is the new voume if 0.500 mole O2 gas is added?
BNCT relies on the initial targeting of tumor cells by an appropriate chemical compound tagged with 10 5 B , which preferentially concentrates in tumor cells.
A 275-g sample of nickel at 100.0C is placed in 100.0 mL of water at 22.0C. What is the final temperature of the water.
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