The results obtained from the analyses of percentage by mass composition of chromium aqua chloride compounds A and B have the following cpercentage composition by mass ; Cr = 22.6, H2O = 31.2 and Cl =46.2. Compound A does not form precipitate with AgNO3 in aqueous solution while B does. I ) Determine the chemical formula the compounds of A and B showing clearly their
coordination sphere and giving reasons. [ Atomic masses in gram : H=1.0 , O=16.0
Cl =35.5 and Cr=52]
II ) Determine the primary and secondary valances of chromium in the two
compounds.
III) Determine the effective atomic number of Cr in A and B

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Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced. be sure your answer has the correct number of significant digits.