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The zinc in a 1.274g sample of foot powder was precipiated as ZnNH4PO4. Strong heating of the precipiate yielded 0.4089g Zn2P2O7. Calculate the mass percent of zinc in the sample of foot powder.
What is the molarity of the salt formed when 100 mL of 1.0 M NaOH and 100 mL of 1.0 M HBr?
Cesium atoms are the largest naturally occurring atoms. The radius of a Cs atom is 2.62angstroms. How many Cs atoms would have to be laid side by side to give a row of Cs atoms
What peptide remains after two sequential Edman degradations of the pentapeptide Ser-Pro-Gly-Phe-Arg
which compound would have the lowest boiling point?a. heptaneb. 223-trimethylbutanec. 3-methylhexaned.
The density of liquid oxygen at its boiling point is 1.14 {kg/L} , and its heat of vaporization is 213 {kJ/kg} . How much energy in joules would be absorbed by 4.0 L of liquid oxygen as it vaporized?
calculate the amount of heat liberated in kj from 295 g of mercury when it cools from 82.0degc to 12.0degc. the
The excess EDTA from this reaction required 19.77 mL of 0.01883 M Pb2+ standard solution to reach an end point. Calculate [Cu2+] in the unknown
Hydrogen sulfide , H2S , has the characteristics odor of rotten eggs. If a sample of H2s GAS AT 759.0 TORR AND 29.0 C IN A 3.00 -L container is allowed to expain into an 11.0-l container at 29.0 c, what is the pressure in the 11.0-l container
The temperature of the calorimeter rose from 25C to 33.73C. If the heat capacity of the calorimeter was 9,630 J/C, what is the value of delta H for the combustion reaction in KJ/mol.
Hydrochloric acid is added to zinc. How many mls of 0.500 M HCl are needed to react completely with 25.0 g of zinc metal
a cylinder of compressed nitrogen gas contains 867 g n2. if the volume of the cylinder is 22.5 l what is the pressure
If 15 g of KClO3 are added to 200 g of water at 25 degrees celsius with stirring, how much of the KClO3 will dissolve?
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