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A student was asked to identify an unknown hydrate by following the procedure described in this module. After heating and cooling, a 2.752-g sample of this unknown weighed 1.941 g. Students were given a list of possible compounds from which to identify their unknowns: LiNO3 . 3 H20, Ca(NO3)2 . 4 H2O, and Sr(NO3)2 . 4 H2O.
a) Calculate percent water in the students unknown.b) Could the unknown possibly have been Sr(NO3)2 . 4 H2O? Briefly explain.c) What is the probable identity of the students unknown?d) Based on the students results and your answer to (c), what is the most probable source of error in the experiment?A student was asked to identify an unknow hydrate by following the procedure described in this module. After heating and cooling, a 2.752-g sample of this unknow weighed 1.941 g. Students were given a list of possible compounds from which to identify their unknowns: LiNO3 . 3 H20, Ca(NO3)2 . 4 H2O, and Sr(NO3)2 . 4 H2O.
a) Calculate percent water in the students unknown.b) Could the unknown possibly have been Sr(NO3)2 . 4 H2O? Brieflyexplain.c) What is the probable idenity of the students unknown?d) Based on the students results and your answer to (c), what is themost probable source of error in the experiment?
How much energy (in kilojoules) is required to convert 225 mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL?
A second 25.00-mL aliquot was then treated with an excess of BaCl2 and 25.00 mL of the base; precipitation of all the carbonate resulted, and 7.63 mL of the HCl was required to titrate the excess base. Calculate the composition of the mixture.
Which of the following correctly describes what happens when the temperature of a chemical reaction is increased? Not: assume that the mechanism for the reaction does not change.
considering the given reaction 2s3o2rarr2so3 in which elemental s reacts with oxygen to produce so3 then find out how
You may use expanded, condensed, or line structures, provided they are neat and legible. If you could not identify one of your components, then pick an appropriate component from the list of unknowns.
the mass propotion of Mg:N=18:7. if 3.60 g reacts with 4.20 g N2 gas so the mass of product Mg3N2 is?
Determine the shape (geometry) of PCl3 and then decide on the appropriate hybridization of phosphorus in this molecule
what is the term for a solution whose concentration has been accurately determined usually three or four significant digits? normal solution standard soluatoin stock soluation
The neutrons from one treatment source have an average velocity of 3.4 x 10^7 m/s. If the velocities of the individual neutrons are known to within 2% of this value, what is the uncertainty in this position of one of them
A gas bottle contains .650 mol of gas at .961 atm pressure. If the final pressure is 1.15 atm, how many moles of gas were added to the bottle.
Write charge and mass balances for aqueous Ca3(PO4)2if the species are Ca2+, CaOH+, CaPO4-,PO43-, HPO42-, H2PO4-and H3PO4
A gas sample containing 1.47 mol at 25°C exerts a pressure of 401 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800. torr,
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