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Samples of hydrated manganese perchlorate are heated to determine the amount of crystal water:Mn(ClO4)2·nH2O ! Mn(ClO4)2 + nH2OTwo samples of different weight are studied:a) m (before heating) = 1.629 g ; m (after heating) = 1.142 gb) m (before heating) = 9.048 g ; m (after heating) = 6.645 gFor both samples, calculate the number of moles of crystal waterper formula unit of manganese perchlorate. Decide which sample is most likely to represent the correct result, and explain what might have gone wrong with the other.
What volume of gold would be equal in mass to a piece of copper with a volume of 140.0 mL? The density of gold is 19.3 g/mL; density of copper is 8.96 g/mL
Using the equation Fe2O3+2Al-->2Fe+Al2O3, how many grams of Al are needed to completely react with 135 g Fe2O3
How many electrons should we expect to see associated with the lowest energy peak in the photoelectron spectrum of the element Arsenic (As)
What is the partial pressure of nitrogen in air at atmospheric pressure (1 atm)? Assume ideal behavior. Express your answer numerically in atmospheres.
Decane has 4.5 min retention time on HP-1 column (25 m length, 0.25 mm I.D., 0.33 mkm film thickness) at 120C. Calculate the capacity factor for decane on HP-1 column (25 m length, 0.25 mm I.D., 0.5 mkm film thickness) at 120C. Explain.
Consider a solution containing 0.100 M fluoride ion and 0.126 M hydrogen fluoride. The concentration of hydrogen fluoride after addition of 5.00 mL of 0.0100 M HCl to 25.0 mL of this solution
Calculate the mass(in grams) of solids you must measure out to prepare 100 mL each of 0.025 M CuSO4, 0.025 M Ca(NO3)2, 0.025 M Al(NO3)3, and 0.025 M KCl.
Decide whether or not each of the following metals dissolves in 1 M . For these metals that do dissolve, write a balanced redox reaction showing what happens when the metal dissolves.
using a gas sample of 757 ml is compressed at stp to a volume of 118 ml and the temperature raised to 39 degrees c.
Question- What is the purpose of the hexane in the halogen displacement? Into which layer water or hexane would the following species reside? Cl-, I2, Cl2, Br-, I-, Br2
what is the pressure in atmospheres inside a container of gas connected to a mercury-filled open-end manometer when the
a 0.331-g sample of aspirin prepared in the lab was dissolved in 95% ethanol and titrated to a phenophthalein endpoint with 16.7 ml of 0.107M NaOH Calculate moles of scetylsalicylic acid present in the aspirin sample ;What mass (g) of scetylsalicy..
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