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Sulfur-38 has an atomic mass of 38.0 and a half-life of 2.87 h. How long does it take for 99.99% of a sample of sulfur-38 to decay?
Lactic acid, C_3H_6O_3, is found in sour milk. A solution containing 1.00 g NaC_3H_5O_3 in 100.0 mL of 0.0500 M C_3H_6O_3 has a pH = 4.11. What is Ka of lactic acid
To study the effect of a weakly acidic medium on the rate of corrosion of a metal, a chemist prepared a buffer solution by making it 0.11 M NaC2H3O2
Assume that the specific heat of the substance at P=25 bar is temperature independent and equal to c_p=4.20 kJ/kg*K. Sketch the P-v and T-s diagrams of the cycle.
assume that rubbing alcohol of 1.02 grams evaporates from a 70.0 nbspgrams of aluminum block. aluminum block is at 25
How many moles of CS_2 are produced if 6.85 mol C and 2.95 mol SO_2 are reacted together
What is the density (in grams per liter) of a gas mixture that contains 20.5% F2 and 79.5% He by volume at 793mm Hg and 28.5C
The four molecular p orbitals of the four carbon atoms can be lined up parallel in order to create four new molecular orbitals. The electrons in the new molecular orbitals benefit because they are not confined to just one atom.
draw the mechanism for the reaction between 3-chloroaniline and diethyl ethoxymethylenemalonate.
15 g of steam at 373 K is added to 250 g of H2O (liquid) at 298K at onstant pressure of 1 bar. Is the final state of the system steam or liquid water? Calculate changes in entropy for the process.
Zinc citrate (Zn_3(C_6H_5O_7)_2) is an ingredient in toothpaste. It is synthesized by the reaction of zinc carbonate with citric acid. 3ZnCO_3(s) + 2C_6H_8O_7(aq) ---> Zn_3(C_6H_8O_7)_2(aq) + 3H_2O(l) + 3CO_2(g).
Plaster of Paris, CsSO4 x XH2O, is a fractional hydrate; that is, one water molecule attaches to more than one formula unit. If a 2.002-g sample has a mass of 1.878 g after hearing, find the water of crystallizatioin (X), and write the formula for..
Calculate the number of grams of NaOH per 100ml to give a pH8.0 solution if pure water at pH7.0 is used in the experiment. Repeat this calculation for a pH6.0 solution using HCl.
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