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A mixture of CaCO3 and CaO weighing 0.698 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.434 g. Assuming all the CaCO3 broke down to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.
A 0.85g sample of commercial lye (containing NaOH and other inert ingredients) is dissolved in water and titrated with 37.00ml of 0.525 M HCl. What is the percent purity (mass of NaOH/mass of sample x 100) of the lye sample
Calculate the pH of a 1.36x10^-2M solution of the decongestant ephedrine hydrochloride if the pKb of ephedrine (its conjugate base) is 3.86.
Assume that all ethanol is transformed into CO2 and assume the lake contains 10^8 liters of water. Explain your answer with the chemical reaction involved and any assumptions you make.
A student heated 1.0L of ethanol (density 0.789 g/L) with 1.0 mL ethanoic acid (density 1.049 g/mL) with a sulfiric acid catalyst and noticed a vinegar-like smell to the product as well as a fruity medicinal smell.
In a 1.0× 10-2 M solution of NH4ClO4(aq), identify the relative molar amounts of these species from Most to Least.
Important information about Net ionic equation, What is the net ionic equation of 2Fe(NH4)2(SO4)2*6H2O + 6K2C2O4 + H2O2 + H2SO4
Carbon monoxide competes with oxygen for binding sites on the transport protien hemoglobin. CO can be poisonous if inhaled in large quantities. A safe level of CO in air is 50 ppm
Show your calculations for preparing the following solutions: 200ml of 20% (w/v) NaOH, 1 liter of 1.0M Tris [molecular weight (wm)= 121.1g/mol], and 100ml of 0.2M EDTA (mw =372.2g/mol)?
Compute the free energy of hydrolysis of Adenosine Tri Phosphate in a rat liver cell in which the ATP, ADP and Pi concentration
Although the mechanism of the coupling process is not well understood, it is known that ratre appears to depend on the square of the concentration of the halide.
The first ionization energies for Ge, As, and Se are 762, 944, and 941kJ/mol, respectively. Explain these values in terms of their electron configurations.
the heat of fusion of ice at this temperature is 5610 J/mol. Find entropy change of the universe when 3mol of water freezes at -10degreesC
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