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write the reactions for which the enthalpy change will be for solid aluminum oxide include
a if 323 grams of zinc oxide and 72 grams of water combine to form zinc hydroxide how many grams of zinc hydroxide must
the vapor pressure of ccl3f at 300 k is 856 torr if 115 g of ccl3f is enclosed in a 12 -l container will any liquid be
the density of a human body can be approximated by the density of water which is equal to 1000 x 103 kgm3 what volume
the density of an unknown metal is 123 gcm3 and its atomic radius is 0134 nm it has a face-centered cubic lattice find
solution b is made by taking 150ml of solution a and diluting it to 10000 ml if solution b is found to contain 550ppb
calculate the change in ph when 300 ml of 0100 m hclaq is added to 1000 ml of a buffer solution that is 0100 m in nh3
a compound has a molar mass of 1101gmol and a composition of 6545c 545 h and 2909 o calculate the molecular formula of
an unknown metal forms two different compounds with oxygen when a 2412 g sample of the metal is combined with oxygen
a particular brand of gasoline has a density of 0737 gml at 25 c how many grams of this gasoline would fill a 124 gal
how many covalent bonds with other atoms will a sulfur atom with 6 electrons in its outer shell most likely make and
drink cost 100 for 24oz or 076 for 050l assume 1qt32oz what is the price per liter of the 24oz
1 a mixture of ethane and methane is contained a glass bulb of 500 cm3 capacity at 25 degree celsius the pressure is
what is the difference between a certain number and an uncertain number in a measurement which certain and uncertain
using the standard enthalpies of combustion calculate the standard enthalpies of the following reactionsa
describe the preparation of 200 l of 0100m ph 900 glycine buffer starting with the sodium chloride salt of zwitterionic
if a pipette was incorrectly calibrated so that it transfers 5 too much solution would the density you calculated for
the standard free energy of activation of one reaction a is 9500 kj mol-1 2271 kcal mol-1 the standard free energy of
write the chemical formulas and names of binary acids and oxoacids that contain group 7 a elements do the same for
methane can be decomposed into two simpler substances hydrogen and carbon therefore
lactic acid has a pka of 386 if the concentration of lactate is 042 m and the concentration of lactic acid is 225 m
calculate the ratio of the concentration of acetate and acetic acid required in a buffer system of ph410 the pka of
magnesium metal reacts with hcl solution liberating h2 gas and generating mg2 cations in solution a 2970-g sample of mg
the metal rhodium has an fcc crystal structure if the angle of diffraction for the 311 set of planes occurs at 3612deg
two students determine the percentage of lead in a sample as a laboratory exercise the true percentage is 2252 the