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Problem- Calculate the mocular weight of an unknown substance of 0.2064 grams of solid was added to 25.00 ml of cyclohexane and the resulting solution exhibited a freezing point depression of 2.1 degrees C
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CO exhibits an infrared absorption band at 2143 cm^-1 that is attributed to the symmetric stretching transition. Assuming this corresponds to a transition from the v=0 to v=1 vibrational quantum number
How much energy (in J) is required to change the temperature of 1.00 kg Fe from 25.0°C to 1515°C? The specific heat capacity of iron is 0.449 J/g*°C.
6Li(s) + N2(g)------ 2Li3N(s) a, What is theortically yield of Li3N in gram when 12.1gm of Li is heated with 33 gm of N2? b, If actual yield of Li3N is 6.09g what is the percent yield of reaction
find the mass percentage of nh4cl nacl andsio2 in an unknown mixture if 5.0655 gm of this mixture when heated at 340 0c
The solubility product for strontiumcarbonate is 10-9.30 M2. The formation constant for the hydroxocomplex Sr(OH)+, is 100.82 M-1
An alloy of iron contains 75.0% iron and 25.0% other elements. How many grams of iron are present in 150. g of the alloy?
How many grams of water can be cooled from 45c to 15c by the evaporation of 65g of water? (The heat of vaporization of water in this temperature range is 2.4kj/g. The specific heat of water is 4.18j/k*mol .)
Explain which one of the subsequent conditions is always true for a titration of a weak acid with a strong base. A colored indicator with apKa less than 7 should be used.
Calculate the mass of aluminum deposited on the purified aluminum metal by the application of a current of 1.225 kiloamperes for 30 minutes from a very large quantity of a solution containing Al3+ ion in the Al2O3/Na3AlF6 molten state.
A particular coal encloses 2.5% sulfur by mass. While this coal is burned the sulfur is converted into sulfur dioxide gas. Explain the sulfur dioxide reacts with calcium oxide to form solid calcium sulfite.
How much of the solution is needed?
High-purity benzoic acid (C6H5COOH; delta H rxn for combustion= -3227 KJ/mol) is used as a standard for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity= 1365 J/degrees Celsius) that contains exactly 1.570 kg o..
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