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A 3.5514 g of a chromium oxide was found to contain 2.4299 g of chromium and 1.1215 g oxygen. What is the empirical formula for this chromium oxide
What is the heat of vaporization(kJ/mol) if it takes 3,452 J of heat to completely vaporize 2.68 moles of the liquid at its boiling point
Draw the major organic product formed in the following reaction. (The reaction stoichiometry is 1 mol reactant: 1 mol Br2.)
HCN is a weak acid dissolved in water. (Ka=6.2x10^-10). If a 50.0mL sample of 0.100 M HCL is titrated with 0.100 M NaOH 1) what is the pH at the equivalence point
A 250 gram sample of water at the boiling point had 45.0 kJ of heat added. How many grams of water were vaporized? Heat of vaporization for water is 40.6 kJ/mole
The volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62 degrees Celsius. the gas is? SO2, SO3, NH3, NO2, or Ne
When electrons in a molecule are not found between a pair of atoms but move throughout the molecule, this is called
How many kJ of heat are needed to completely vaporize 1.30 moles of The heat of vaporization for water at the boiling point is 40.6 kJ/mole.
A 0.100 M sample of NiSO4 gave an absorbance of 0.60 at 600 nm in a 1 cm cuvette. What is the nickel concentration of a solution giving an absorbance of 0.20 in the same cuvetter at the ame waveleng
How many moles of gas are there in a 45.0 L container at 25.0 degrees Celcius and 500.0 mm Hg
A 25.0 ml sample of 0.105 M HCl was titrated with 31.5 ml of NaOH. What is the concentration of the NaOH
What is the concentration of the hydroxide ion given that the concentration of the hydronium ion is 1.5 x 10^-5 M
If the reaction of 25.0 mL of 1.0 M HBr and 35.0 mL of 1.0 M KOH produces 1.45 kJ of heat, what is the change in entalpy of HBr + KOH per mole of water formed
choose the correct answer for the atom using the periodic chart. Larger atomic or ionic radius, F or F(-)
For the set of elements Li, O, Ne, and Na which element has the largest atomic radius? Explain any deviation from the expected pattern.
What is the theoretical yield (in grams) of gold when 1.378 L of hydrogen gas (density = 0.0902 g/L) reacts with 20.14 g of gold(III) chloride in solution
this gas is compressed to a volume of 286 mL and the pressure increases to 901 torr, what will be the new temperature of the gas (reported to three significant figures in °C)
What is the final pressure (atm) of a 3.05 L system initially at 724 mm Hg and 298 K, that is compressed to a final volume of 3.00 L at 273 K
The hydrogen gas formed in a chemical reaction is collected over water at 30 at a total pressure of 737. What is the partial pressure of the hydrogen gas collected in this way
Based on understanding of enthalpy, what is the sign of dH for the binding of Cu2+ to soil. Explain.
Which of the following represents the energy that is not available in a system to do work at a particular temperature
How would you determine the dS and dH for Cu2+ binding soil given K (distance) values at two different temperatures
A balloon contains 0.120 of gas and has a volume of 2.83 .If an additional 7.2×10?2 of gas is added to the balloon, what will its final volume be
Which of the following represents the maximum available useful energy when a system changes spontaneously from a given initial state to a given final state
A syringe containing 1.65 of oxygen gas is cooled from 94.6 to 5.0. What is the final volume of oxygen gas