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Find the amount of known substance present in the mixture.
A mixture of calcium carbonate and calcium oxide that weighed 1.727g was heated until all the calcium carbonate was decomposed to calcium oxide .after heating the sample weighed 1.551g. Calculate the mass of calcium carbonate present in original mixture.
Finding the Thermodynamic parameters (Enthalpy of the reaction).
How many liters of cyclohexane need to be burned to release as much energy as burning 10.0 Ib of pine logs? The density of cyclohexane is 0.7785g/mL, and its DeltaH comb = -46.6kj/g.
An ideal gas mixture of 1.00g N2 and 3.0g He is placed in a 1.00L container at 30 °C. What is the partial pressure of He
The density of titanium metal is 4.51 g/cm^3 at 25 degrees C. What mass of titanium displaces 64.0 mL of water at 25 degrees C?
Consider 4 L of a buffer composed of 2 M HCN and 3 M NaCN? How many moles of strong acid could this buffer withstand?
an unknown salt is either naf nacl or naocl.when 0.050 mol of the salt is dissolved in water for form 0.500 l of
Alkenes can be converted to alcohols by reaction with mercuric acetate to form a ?-hydroxyalkylmercury(II) acetate compound, a reaction called oxymercuration. Subsequent reduction with NaBH4 reduces
If one collects the first liter of gas that moves from the original room into the evacuated room, approximately what would you expect its composition to be? Would it be the same as regular air?
Calculate the quantity of energy produced per gram of reactant for the fusion of H-3 (atomic mass = 3.016049 amu) with H-1 (atomic mass =1.007825 amu) to form He-4
If you have 300.0 mL of water at 25.00 °C and add 140.0 mL of water at 95.00 °C, what is the final temperature of the mixture. Use 1.00 g/mL as the density of water.
The rate of decrease in N2H4 partial pressure in a closed reaction vessel from the reaction N2H4(g)+H2(g)?2NH3(g) is 80torr/h . What is the rate of change of NH3 partial pressure in the vessel?
what product would you obtain after evaporation of the water from the sodium hydroxide layer before acidifying and filtering the layer
Standard Temperature Pressure and Volume, The respiratory rate of a person is 20 breathes per minute. If every average breath is about 310cm^3 of air at 22C and 740mmHG
a if 65.65 g of mercuryii nitrate and 4.26 g of hydrogen sulfide are mixed in 490.0 g of water to form 54.16g of
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