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Problem- A 3.910g sample of a mixture was analyzed for barium ion by adding a small excess of sulfuric acid to an aqueous solution of the sample. The resultant reaction produced a precipitate of barium sulfate, which was collected by filtration, washed, dried, and weighed.If 0.2635g of barium sulfate was obtained, what was the mass percentage of barium in the sample?
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For the reaction 3 C2H2(g) C6H6(l) at 25C, the standard enthalpy change is -631 kJ and the standard entropy change is -430 J/K. Calculate the standard free energy change at 25C.
Compounds of boron and hydrogen are remarkable for their unusual bonding and also for their reactivity. With the more reactive halogen
dr. browns new house will need to use propane c3h8 gas to fuel the range because natural gas service is not available
What mass of Cu is deposited on an automobile trim piece if plating continues for 1.25 h at a current of 3.7 A
KNO3 dissolves in 100g water @31.6g 20 degrees C; 85.5g 50 degrees C; 202g 90 degrees C. Is enthalpy of solution positive or negative
Draw resonance structures to show in which position 4-methylacetanilide will undergo nitration.
A steam engine works between TH = 140C and TC = 30C. Calculate the minimal withdrawal from the hot source to yield 1 kJ of work
What is the fractional conversion of ethane? b) What is the production rate of ethanol?
Problem- Calculate the Molarity of NA+ in an aqueuous solution prepared by dissolving 1.00g of NACL(S) in water, and the final volume of the solution is 10.0 L Note g is the gram unit, and L is the liter unit.
If iron(III) oxide has a crystal structure that is face-centered cubic in iron ions, how many oxide ions are in one unit cell of iron(III) oxide.
Two identical ballons are filled, one with helium and one with nitrogen, at the same temperature and pressure. if the nitrogen leaks out from its balloon at the rate of 75 ml x h -1 what will be the rate of leakage from the helium filled balloon
the initial volume of a sample of argon gas is 938 ml at 178degc. if the pressure is held constant and the volume is
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