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A 5.326 g sample of an unknown compound is found to contain 3.758 g of carbon, 0.316 g of hydrogen, and 1.251 g of oxygen. What is the empirical formula of this substance
calculate the change in pH that occurs when 1.00 mmol of a strong acid is added to 100 mL of 0.0500 M HCl.
How much heat is absorbed by a 125g sample of water when it is heated from 25.200C to 32.800C? The specific heat of water is 4.184 J/g0C.
A sample of CO2 gas at 795 torr is cooled from 25°C until the new pressure is 125 torr. Calculate the new temperature of the gas.
One of the reasons that back titration is preferred to direct titration is because of the limited solubility of carbonates in water. Why does this make direct titration difficult and why does back titration tend ot circumvent this difficulty
A 0.5 M solution of hydrogen sulfide (H2S) contains 0.15 M nickel chloride NiCl2, and 0.35 M mercury nitrate Hg(NO3)2. The pH of this solution is made very acidic through the use of HCl so that all ions are in solution
A 100 mL sample of an aqueous solution at 25 C contains 20.4 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 5.88 torr, what is the molar mass of the unknown compound
gaseous hydrocarbon required 50 mL of oxygen for complete combustion. If 30 mL of CO2 gas were evolved, what is the molecular formula of the hydrocarbon?
The major industrial method for the preparation of elemental phosphorus is heating a mixture of phosphate rock, carbon, and sand in an electric furnace. The chemical reactions can be represented by
According to the following reaction, how many moles of ammonium nitrate are necessary to form 0.625 moles water
the radiu of the aluminum atom is 143 pm. Verify that the metal crystallizes as a face-centered cube.
Identify the statements that accurately describe how hydrogen ion concentration relates to energy production in oxidative phosphorylation. ATP synthase provides energy in the form of ATP to actively transport H+ into the mitochondrial matrix.
If Delta H = -80.0 KJ and Delta S = -0.200 KJ/K, the reaction is spontaneous below a certain temperature. Calculate that temperature.
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