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An archaeological sample contains .755 curies of lead-206 and 1.455 curies of uranium-238. Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample. The half-life of uranium-238 is 4.51 x 109 years. What is the age of the sample?
If a student added twofold of acetone the acetone will react with itself and the product would be isolated as diacetone alcohol or mesityl oxide. Write a complete reaction to support your result.
What is the complete mechanism for the synthesis of triphenylmethanol from phenyl magnesium bromide
in the reaction p4 5 o2 rarr 2 p2o5 how many moles of o2 are consumed each time 0.5 moles of p2o5
What is the heat of vaporization(kJ/mol) if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point
Having trouble with a couple of study guide questions for Chemistry. Hoping someone can assist: PART 1: Calculate the pH of a buffer solution that is 0.250 M in HCN
What is the molarity of a sodium hydroxide solution if 25.0 mL of this solution reacts exactly with 22.30 mL of .253 M sulfuric acid
Explain which balance(s) will give the maximum precision possible for the density measurement? Is there an advantage to utilizing the 0.0001-gbalance for this work. Explain.
how do you calculate the hydrogen ion concentration in moles per liter for a solution with at pH value of 11.21? Need the steps please.
when 157 mg. of dipentylamine was added to 122 mg. of benzoic acid and 2 mL of water, a completely homogenous solution was formed. Draw the structure of the species present into the water.
a 5.00 ml sample of barium hydroxide is titrated to the phenolphthalein endpoint using hydrochloric acid. the five ml
Will B-myrcene and allo-ocimene structures not form Diels-alder adducts with maleic anhydride? explain why in each case.
A sample of gas occupies a volume of 400 mL at 0.740 atm and 70 oC. Calculate the pressure of the gas if its volume is changed to 360. mL while its temperature is held constant.
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