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Calcium reacts with iodine to form an ionic compound. If a sample of the compound contains 8.5 x 1019 iodide ions, how many calcium ions does it contain?
Calculate the molar mass of a nonelectrolyte that lowers the freezing point of 25.00 g of water to 3.9°C when 4.27 g of the substance is dissolved in the water.
Compare the volume of 1.0 g of bromine, Br2, as a solid, liquid, and gas. The density of solid bromine just below the melting point of -7°C is 3.2 g/mL, of liquid bromine at 25°C is 3.1 g/mL.
A meteorological ballon contains 250.0L He at 22 degrees celsius and 740.0mm Hg. If the volume of the ballon can vary according to external conditions
How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction below? Change in H degrees for the reaction is +624.6 kJ. SiO2 (g) + 3C (s) -> SiC (s) + 2CO (g)
3.38 grams of nitrogen gas are mixed with excess oxygen gas. The reaction yields 6.63 grams of nitrogen monoxide. nitrogen (g) + oxygen (g) -> nitrogen monoxide (g)
500.0 g of ammonia react with 51.0 moles of sulfuric acid to produce ammonium sulfate. How many moles of excess sulfuric acid are left over after the reaction is complete?
Determine the total number of atoms in this chemical formula and calculate the molar mass of the solute and how many moles of solute are in the solution?
The nitro group needs to be taken off as well. I can't seem to find any reference materials on what reagrents can be used. Can you please advise?
How many moles of oxygen are needed for the complete combustion of 9.88* 10^21 molecules of hexane?
Draw a potential energy diagram that represents the three step mechanism for the reaction and label the reactants and products for the overall reaction. Assume the overall reaction is endothermic
Given the tabulated data, what is the lattice energy of crystalline calcium chloride?
The half-life for a first order reaction at 550 oC is 85 sec. How long it would take for 23% of the reactant to decompose?
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