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In most of its ionic compunds cobalt is either Co(II) or Co(III). One such compound containing chloride ion and water of hydration, was analyzed, and the following results were obtained. A 0.256g sample of the compound was dissolved in water, and excess silver nitrate was added. The silver chloride was filtered, dried, and weighed and it had a mass of 0.308g. A second sample of 0.416g of the compound was dissolved in water and an excess of sodium hydroxide was added. The hydroxide salt was filtered and heat in a flame forming cobalt(III) oxide. The mass of cobalt (III)oxide was 0.145g. A. What is the % composition by mass of the compound? B. Assuming the compound contains one cobalt ion per formula unit what is the formula? C. Write a balanced chemical for each of the three reactions described.
Calculate the lattice energy of Na2O for the following data: Ionization energy of Na(g):::495kj/mol, Electron affenity of O(g) for 2e-:::603 kj/mol
Use the periodic table to write electron configurations for each of the following elements. Represent core electrons with the symbol of the previous noble gas in brackets. S Ge Zr Sb
The amount of energy needed to heat 2.00 g of carbon from 50.0°C to 80.0°C is 42.6 J. The specific heat capacity of this sample of carbon is ?
How many kilojoules are needed to raise the temperature of 125 g of copper from 22 deg C to 325 deg C? My book shows copper at 0.385 j/g. Here is what I have done so far but I am not sure? 125 g x 303 deg C x 0.385 j = 14600. j 14600/1000 = Conver..
considering the given equationcuscn kio3 hcl rarr cuso4 kcl hcn icl h2o balance the equation using the smallest
a sample of air from the basement of a home is found to contain 8.3 ppm of radon. what is the partial pressure of radon
Referring to Table 17.1, calculate the mole fraction of Xe and its concentration in parts per million by volume.
When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 15.0 fluid ounce drink from 71°F to 32°F, if the heat capacity of the drink is 4.18 J/g·°C?
Calcium and Magnesium carbonates occur together in the mineral dolomite. Suppose you heat a sample of the mineral to obtain the oxides,CaO and MgO, and then treat the oxide sample with HCl. If 7.695g of the oxide sample requires
Assuming that the gas is at standard temperature and pressure there is 1.00 mole per 22.4 L of volume how many argon atoms are there present in this sign
The flask from part (a) is heated to 900 K, and when the system has comt to equilibrium, the total pressure in the flask reaches 1.814. Find the value of the equilbrium constant for the above reaction at 900 K
Calculate the values of E for the cell when the following volumes of the Ce^4+ titrant have been added. (Activity coefficients may be ignored as they tend to cancel when calculating concentrations of ratios.
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