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A solution made from 6.50 g of an unkown compound in 27.8 g of diphenyl has a molality of 0.195 m. Calculate the molar mass of the unknown?
a copper wire density 8.96 gcm3 has a diameter of 0.50 mm. if a sample of this copper wire has a mass of 48 g how long
If hydroxide ion is formed, the OH- may react with some of the Fe3+ to produce an insoluble hydroxide. Will the percent yield of the iron (III) compound containing a complex ion be affected by the formation of the insoluble hydroxide
Calculate the energy and the wavelength, in nanometers, of light emitted when an electron in an excited hydrogen atom falls from the n=3 level to the n = 1 level.
consider the titration of 50.00 ml of 0.1000 m hno2 ka 7.1bull10-4 with 0.1000 m naoh solution. what is the ph after
A mixture of four gases exerts a total pressure of 860 mm Hg. Gases A and B each exert 220 mm Hg. Gas C exerts 110 mm Hg. What pressure is exerted by gas D?
20 millilitres of H2SO4 solution was titrated against 0.2M NaOH and required 12.4 millilitres to reach the end point. calculate the concentration of the H2SO4 solution in (a)Molarity (b) g/l.
a fishing boat accidentally spills 9 barrels of diesel oil into the ocean. each barrel contains 42 gallons. if the oil
The decomposition of N2O to N2 and O2 is a first- order reaction. At 730°C the half-life of the reaction is 3.58 X10^3 min. If the initial pressure of N2O is 2.10 atm at 730°C, calculate the total gas pressure after one half-life.
If the equilibrium concentrations of both Cl2(g) and Br2(g) are 0.0200 M in a closed container, what will be the partial pressure of BrCl
Number these in order of ease of hydrolysis. 1= easiest to hydrolyze 4=hardest to hydrolyze C6H5C(=O)OC66H5 C6H5C(=O)OCl C6H5C TRIPLE BOND N C6H5(=O)NHC6H5
The element lanthanum has two stable isotopes, lanthanum-138 with an atomic mass of 137.9 amu and lanthanum-139 with an atomic mass of 138.9 amu
What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?
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