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If four moles of sodium sulfate are dissolved in water how many moles of sodium ions would be in solution?
A. 5B. 3C. 2D. 8E. 4F. 7G. 6H. 1
silica gel columns having smaller particle size procedure more effective chromatographic separations
The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum-139.
Calculate the partial pressure of each gas and the total pressure after the valve between the flasks is opened. P(He) in mmHg P(Ar) in mm Hg Ptotal in mm Hg
There are 86,472 houses in the county and the county occupies a space totaling 475 square miles. How many square miles of housing are present in Chem county?
200g of magnesium phosphate and 250.0g of copper bromide react, how much copper phosphate will be produced?
draw an energy level diagram for Hydrogen starting at n=2 and ending at n=6. (n=1 transitions are high-energy transitions and emit in the ultra-violet region).
Calculate the values of E for the cell when the following volumes of the ce4+ titrant hav been added:(Activity coefficients may be ignored as they tend to cancel when calculating concentration ratios). 1.50 ml 20.0 ml 39.0 ml 40.0 ml 44.0 ml 80.0 ..
A catalyst decreases the activation energy of a particular exothermic reaction by 59 kJ/mol, to 51 kJ/mol. Assuming that the mechanism has only one step, and that the products are 94 kJ lower in energy than the reactants
A 5.34 g sample of an aluminum alloy is reacted with hydrochloric acid to produce aluminum chloride and hydrogen gas. At a temperature of 298 Kelvin and a pressure of 1.03 atm, a volume of 1.53 L of hydrogen gas is collected.
C3H8O3 (density=1.26 g cm-3) is added to a kilogram of water. What is the mole fraction C3H8O3 in the solution?
The pressures ranges between 0.2 bar and 60 bar. Determine the net work produced and the efficiency of the cycle?
If 3.98 g of copper was recovered and you started with 9.10 g of copper (II) chloride, then what is the percent yield of the reaction ?
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