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A 29.60-mL sample of 0.0750 M Ca(OH)2 is added to 30.28 mL of 0.100 M HCl. How many moles of excess base are present? How many additional mL of 0.100 M HCl would be required to neutralize the solution?
Benzene freezes at 5.45 oC. The Kf for benzene is - 5.07 oC/m. What would be the freezing point of a 0.210 m solution of octane in benzene?
in an organic compound % of carbon is 75.2%,% of hydrogen is 10.75 and % of oxygen is 14.03..Find the empirical formula of compound?
what is a good conductor at high temperature and a poor conductor at low temperature? YBa2Cu3O7 GaAs S Cu
Given that B(SiO) 640 kJ/mol, show that bond enthalpy considerations predict that silicon-oxygen compounds are likely to contain networks of tetrahedral with SiO single bonds
A compound contains only carbon, hydrogen, and oxygen. Combustion of 0.01068 g of the compound yields 0.01601 g of CO2 and 0.00437 g of H2O. The molar mass of the compound is 176.1 g. What are the empirical and molecular formulas of the compound?
the equilibrium contant kc=49 at 230^0C, for the reaction PCl3 + Cl2= PCL5. If 0.50mol of each of phosphorus trichloride and chlorine are added to a 5.0L reaction vessel.
Dipole moment, Formaldehyde has a very large dipole moment (2.33 Debye) whereas carbon monoxide has a very small dipole moment (0.11 Debye)
Using the equation pKa= -log Ka, calculate the Ka from the pH value and the starting acetic acid concentration. Calculate the Ka of acetic acid.
calorimetry can be used to find heats of combustion. suppose a calorimeter helps someone to determine that 4032 kj of heat is released during the combustion of 88.0 grams of propane, C3H8 (44.0 g/mol).
Calculate approximately the heat released when you are given a chemical equation as 2-methyl-1-propene CH 3 ) 2 C CH 2 reacts
What is the percent by mass of NaHCO3 in a solution containing 20 g NaHCO3 dissolved in 700 mL H2O?
A flask contains 0.260 mol of liquid bromine, Br_2. Determine the number of bromine molecules present in the flask.
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