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how many unshared electron pairs must be included in the lewis structure for water , H2O? a-0 b-1 c-2 d-3 f-4
What is the mole fraction of ethanol in this solution. Sdduming ideal-solution behavior, what is the vapor pressure of the solution at 63.5 C. What is the mole fraction of ethanol in the vapor above the solution
Hydrogen has three isotopes (1H 2H and 3H) and chlorine has two isotopes (35Cl and 37Cl). How many isotopic kinds of HCl are there. Write the formula for each, and tell how many protons, neutrons, and electrons each contains.
What is the mass of precipitate (in Grams) that forms when 235.5 mL of 0.129 M Na2SO4 solution is reacted with excess Ba(NO3)2 solution?
From the mean bond enthalpy data given below, estimate the enthalpy change for the complete combustion of one mole of butene at 298 K. (The molar enthalpy of vaporization of water is 45.0 kJ mol-1 at 298K)
Determine the pH of the acid solution before the titration begins and the pH at the equivalence point when 50.0 mL of the NaOH has been added. The Ka of HF is 7.2*10^-4
A second worker approaches to within 5 meters behind a shield that attenuates 60% and remains there for 20.0 minutes. What is the ration between the absorbed doses for the two workers
what mass of CH3CO2H is required to prepare 100.00ml of a 0.48M acetic acid solution?
A sample of H2SO4 contains 1.11 grams of H (1.01 g/mol). How many moles of H2SO4 (98.02 g/mol) are present?
1)When CH4(g) reacts with H2O(g) to form H2(g) and CO(g), 206 kJ of energy are absorbed for each mole of CH4(g) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation.
RNAse is an enzyme that cleaves the P-O5\' bond in RNA. It has two His residues in the active site. Suggest a plausible explanation
Alkyl halides add to alkenes in the presence of AlCL3; yields are the highest when tertiary halides are used . predict the outcome of the reaction of t-pentyl chloride
Based upon 3 SnF2 (ag) + 2 K3PO4 (aq)> Sn3(PO4)s (s) + 6 KF (aq), a 10.000 gram sample of toothpaste containing stannous fluoride gives a 0.145 gram precipitate of stannous phosphate. What is the percentage of SnF2 in the toothpaste sample?
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