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A calorimeter contains 29.0 grams of water(H2O) at 11.5 degree Celsius temperature . When 1.90 grams of a substance (with a molar mass of 81.0 ) is added, it dissolves via the reaction and the temperature of the solution rises to twenty eight degree celsius. compute the enthalpy change for this reaction per mole of this substance?.
What is the solubility of lead fluoride in a solution of 0.050 M of sodium fluoride?
Draw the molecular structure of three monomeric units of the addition polymer that results from polymerization of acetylene. Only show the structure that would be found inside the brackets of a condensed formula for this polymer
4HCl(aq) + O2(g)--->2H2O(l) + 2Cl2(g) how many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of particles?
For the cyclohexanes substituted in the positions indicated, identify the substituents as either axial or equatorial in chair conformers. For example, a 1,2-cis relationship means that one substituent must be axial and one equatorial.
How many grams of formic acid, HCOOH, must be added to 0.210 L of 0.160 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.10? Assume no volume change. Ka of HCOOH = 5.0 10-4.
A covalent compound is composed of a nitrogen atom, a hydrogen atom, and a carbon atom. How many electrons should the Lewis structure of the covalent compound contain?
In the reaction between glucose and oxygen 10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed. What is the percent yield if the density of CO2 is 1.26 g/L?
The standard free energy of formation of nitric oxide, NO at 1000K is 78kJ/mol, calculate the equilibrium constant for this reaction at 1000K, N2(g) + O2(g) 2NO(g)
In a 0.34 M solution of sodium acetate, what concentration of hydronium ions comes from the self-ionization of water? pKb for acetate anion is 9.246
NO (g) + O3 (g)-> NO2 (g) + O2 (g) For the reaction given, the frequency factor A is 8.7 x 1012 s-1 and the activation energy is 63 kJ/mol. What is the rate constant for the reaction at 75°C.
An organic compound X contains C, H, and O. A 16.69 g sample of X underwent combustion analysis, leading to the production of 44.71 g CO2 and 10.99 g H2O. What is the emperical formula of the compound?
Calculate the moles of ammonia produced (e) calculate the partial pressures of all species in the system (f) the total pressure in the system
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