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A compound of Ca, C, N, and S was subjected to quantitative analysis and formula mass determination, and the following data were recorded. A 0.250-g sample was mixed with Na2CO3 to convert all of the Ca to 0.160-g of CaCO3. A 0.115-gm sample was carried through a series of reactions until all of its S was changed to 0.334-g of BaSO4. A 0.712-gm sample was processed to liberate all of its N as NH3, and 0.155-g NH3 was obtained. The formula mass was found to be 156-g/mol. Determine the empirical formula of this compound.
to scale-forming water to convert calcium carbonate to calcium bicarbonate. write the chemical equation for this reaction.
In a laboratory experiment, students synthesized a new compound and found that when 14.10 grams of the compound were dissolved in 208.0 grams of ethanol, the solution began to boil at 78.9510C
Use the following data to calculate the equilibrium constant K for the following reaction at 78?C: 2Br?(aq)+Cl2(g)?Br2(l)+2Cl?(aq) You may assume that ?H? and ?S? are independent of temperature.
Four essential factors can affect the rate of a reaction. Three of these factors can be related to the rate constant of a reaction through an equation known as the Arrhenius expression.
1.it is noted that an iron nail was with the 12gms mass absorbs heat of 15 joule you need to calculate the final
Spilling some of the reaction mixture. b.Adding too much baking soda. c.Adding too much vinegar. d. Not allowing the reaction to go to completion.
What is the emf for this cell when [Fe3+] = 0.50M, PH2 = 0.25 atm, [Fe2+] = 0.010M and the pH in both compartments is 4.00
Question- You want to make a solution buffered at pH = 4.80 using acetic acid (Ka= 1.75x10^-5). You add 16.4 g of sodium acetate to 500 ml of water ad want to adjust the pH with 1.00 M HCl
if the empty cylinder has the mass of 94.2g and the cylinder with water has the mass of 138.7 g what is the mass of water, volume of water and the density of water.
A standard solution was made when 1.276g of pure copper wire (MM= 63.546g/mol) was weighed, dissolved in concentrated HNO3, and diluted to 1.00x102mL. What is the concentration of the stock solution
A solution of methanol, CH3OH, cotains 55.0 grams of methanol in 100. mL of water solution. What is the molarity of methanol in the solution?
One mole of an ideal gas cp=7r/2 in a closed piston/cylinder is compressed from t1=100k p1=0.1 mpa to pf=0.7 mpa by the subsequent pathways. For each pathway, compute dU, dH, q, w(ec) at a)isothermal, b) constant volume, c) adiabatic
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