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A 1.0 ounce piece of chocolate contains 15 {rm mg} of caffeine, and a 6.0 ounce cup of regular coffee contains 105 {rm mg} of caffeine. How much chocolate would you have to consume to get as much caffeine as you would from 3.0 cups of coffee?
A solution of HNO3 is standardized by reaction with pure sodium carbonate: 2H+ + Na2CO3 ---> 2Na+ + H2O + CO2 A volume of 23.66 ± 0.04 mL of HNO3 solution was required for complete reaction with 0.814 ± 0.0009 g of Na2CO3
Centuries before any experiments had been carried out, philosophers had proposed the existence of the atom. Why are the proposals of these philosophers not considered theories?
A 100.0-mL buffer solution is 0.175M in HCIO and 0.150M in NaCIO .What is the pH after addition of 150.0mL of HBr?
Calculate the moles of silver nitrate and sodium chloride. (c) Which reactant is the limiting reagent? (d) Determine the theoretical yield in grams of silver chloride formed.
How many grams of acetic acid acid, CH3COOH, are required to make 350 mL of an aqueous solution with a pH of 2.40? (Ka = 1.8 x 10^-5 for acetic acid)
calculate the number of moles of magnetic iron oxide produced.
A patient is given 5.5 x10^-2 mg of technetium-99 m, a radioactive isotope with a half-life of about 6.0 hours.How long untilth radioactive isotope decays to 6.0 x10-3 mg? (assume no excretin of the nucelotibe from the body.) Answer is in T =hours.
The rate constant for the second order reaction 2NO2 ???&??; N2O4 is 2.79 L/mol •min at 48 oC. If the initial concentration of NO2 is 1.05 M , what is the half-life
What volume (in milliliters) of 0.240 M NaOH should be added to a 0.125 L solution of 0.029 M glycine hydrochloride
vitamin c l-ascorbic acid mw 176.0 gmol is a weak acid pka 4.863. suppose a 500.0 mg tablet is dissolved in water and
find the molecular weight of a gaseous compound if the density is 12.24 g/L, the pressure is 900 torr, and the temperature is 47 degrees celcius.
the consentration of the reactant to drop to 25% of its inital value. what is the rate constant for reaction?
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