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A solution of calcium ions contains 7 meq/250. cm3 of calcium ion. How many moles of calcium ion does this solution contain
A 35.0ml sample gas is enclosed is in a gas tight syringe at 22 degress celcius. If the syringe is immersed in an ice bath a 0 degress celcius, what is the new gas volume.
A different sample of carbon dioxide also contains 27% carbon and 73% oxygen. The percentages are the same for all samples analyzed. Explain these observations with respect to atomic theory.
Given the reaction: 2Al + 3H2SO4 -> 3H2 + Al2(SO4)3 what would be the total number of moles of H2SO4 needed to react completely with 5.0 moles of Al ?
A 113L sample of helium at 27 degrees Celsius is cooled at a constant pressure to -78 degrees Celsius. calculate the new volume of the helium.
Consider the reaction that occurs when a solution containing hydrochloric acid (HCl) is added to a solution containing the weak base methylamine (CH3NH2).
The following ions contain the same number of electrons. Rank them in order of decreasing ionic radii. Rank from largest to smallest radius. Cs^+, I^-, Te^2-, La^3+, Ba^2+, and Sb^3-
Could someone explain this competition and interaction? I know that chromatography is based on the attraction with the stationary phase or mobile phase
Volume of NaOH dispensed (mL) A) 2 ml B) 2.25 ml C)2.25 ml. Moles of NaOH dispensed. Molar concentration of the acid (moles/L)
Meaning, use and calculation of empirical formulas, In this introduction are given the explanation of how to find out an empirical formula if one has found out the chemical elements of an unknown substance and measured their ratio of masses
CaCN2 + 3H2O -> CaCO3 + 2NH3 . How much NH3 is produced if 187 g of CaCO3 are produced?
A bankrupt chemical firm has been taken over by new management. On the property they found a 20,000 m3 brine pond containing 25,000 mg/L of salt
If 6.73 g of Na2CO3 is dissolved in enough water to make 250 mL of solution, what is the molarity of the solution? What is the molarity of the Na+ ions
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