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What is the half-life of a compound if 76 percent of a given sample of the compound decomposes in 43 min? Assume first-order kinetics.
The two salts NaHPO4 and Na2HPO4 are used to make a buffer. Which one is the acid and which one is the base
The mass percent composition of the compound is 53.31% C, 11.19% H, and the rest is O. What is the molecular formula of the compound
a researcher requires 20l if a buffer solution with pH=4.25. How many moles of formic acid, and sodium fomate, could be dissolved in the solution to make this buffer, if none of the equillibrium concentrations should be under 0.100M?
Calculate the specific heat per mole in J/mol°C for each noble gas.comment on the values you obtain. why was the question included. can someone show me how to solve this problem step by step.
consider the composition of dry air in 0 humidity is just about 21 o2 78 n2 and 1 argon by moles. compute the density
Determine the pH of a solution of 10-3 M sodium formate. Formate is a byproduct of microbial metabolism, and can also serve as an energy source for anaerobic bacteria
The chloride in the sample was precipitated by the addition of 47.8 mL of a silver nitrate solution. What is the concentration of the silver nitrate solution?
Energy cannot be transformed from one type to another (e.g., potential to kinetic). 3. Matter can be transformed into energy in a chemical reaction. 4. Energy can be created spontaneously from nothing.
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5.
Elemental exonium (not a real element) consists of two major isotopes
Calculate the maximum amount of CO2 that can be produced when 64.0 g of O2 and 64.0 g of CH3 OH are mixed for the reaction 2 CH3OH + 3 O2 → 2 CO2 + 4 H2 O .
Lactic acid, CH3CH(OH)COOH, has a Ka value of 1.4x10-4. How many grams of lactic acid must be added to make 151.0 mL of solution with a pH of 2.21
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