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The student determined that the mass lost by the same was 1.8053. What was the percent water in the original hydrated sample? Show calculation setup
What could this substance have been? And what must have been contaminating the water in the first place to produce this by reacting with bicarbonate of soda?
2NaHCO3 at equilibrium Na2CO3 +CO2 + H2O Kp= 0.23 at 100 degreesC. If a sample of NaHCO3 is placed in an evacuated flaskand allowed to achieve equilibrium at 100 degree
Consider the reaction N2 + O2 at equilibriumwith 2NO, for which the Kc =.10 at 2000 degrees C.Starting with the initial concentrations of .040 M of N2and .040 M of O2 determine the
The reaction is first order. In an experiment, the initial concentration of cyclobutane was 0.00105M. After heating at 450°C for 455 s, this was reduced to 0.00083 M.
If CH4 gas and C4H8 gas are released simultaneously at the left and right ends respectively of a 50.0 cm long glass tube, at what distance from the left end of the tube will they meet?
In the diffusion of HCl and NH3, does the first appearance of white smoke indicate the first contact of the NH3 and HCl molecules? If the answer is no, how will it affect the calculated value of the
Calculate the molar concentration of oxygen in water at 25 celsius for a partial pressure of 0.22 atm. the henry's law constant for oxygen is1.3 *10 to -3 mol/L*atm
If the sample was heated to constant weight afterreheating, what is the minimum mass that the sample can have afterthe second weighing? Show how you determined your answer
You have to prepare a pH 3.50 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH,H3PO4, HCOONa, CH3COONa, and NaH2PO4.
What do you expect for the sign of ΔS in a chemical reaction in which two moles of gaseous reactants are converted to three moles of gaseous products?
Which compound would youexpect to elute first from the column: unreacted ferrocene,acetylferrocene or diacetylferrocene? why?
Gold can behammered into extremely thin sheets called gold leaf. If a 200-mgpiece of gold (density 19.32g/cm^3) is hammered into a sheet measuring 2.4x1.0ft, what is the average thickness of the she
If it takes 42 minutes for the concentration of a reactant in a first order reaction to drop from .45 M to .32 M at 25 degrees C, How long will it take for the reaction to be 90% complete?
How can you tell the charge on an element/atom? Do you referto the periodic table? Is there some general rules?
EDTA is an organic acid. It is widely used in anaylyzing the hardness (i.e. amount of calcium and magnesium ions) of water. The structure of EDTA. Each molecule of EDTA can react with four molecules
For the reaction at 25 degrees C, 2NO2(g)<----> N2O4(g), the values of delta H and delta S are -58.03 Kj/mol and -176.6 J/K mo, respectively.
A 65.0 g sample of zinc ( specific heat = 0.0922 cal/g X degrees C) was cooled from 100.0 degrees C to 29.4 degrees C in calorimeter cup containing water initially at 21.5 degrees C. Find the mass o
A student titrates 5.00 mL of formic acid with 26.59 mL of 0.1088 M NaOH. At this point the indicator just turns pink. Calculate the concentration of the formic acid.
Calculate the mass of a piece of copper that released 125 calories when cooled from 100.0 degrees celsius to 25.3 degrees celsius. the specific heat of copper is 0.00924 cal/g X degrees celsius.
A bleaching solution contains sodium hypochlorite, NaClO, dissolvedin water. The solution is 0.685 mNaClO. What is the mole fraction of sodium hypochlorite?
The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the solubility of 02 from the air is 2.67 x 10^-4M at sea level and 25 C, what is the solubility of oxyg
Consider a Zn(s) strip and/vs a Cu(s) strip in separate beakers of water. Which of these metals has its reducing strength increased to the greater extent by treatment with 1 M H2S?
What is the osmotic pressure of a solution prepared from 13.7g of the electrolyte HCl and enough water to make 0.500L of solution at 18 degrees C?
If the temperature rise of the calorimeter with water was .570 degrees C, calculate the enthalpy of combustion of magnesium. Mg+1/2 O2 produces MgO