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Sodium hydroxide has a lattice energy of -887 and a heat of hydration of -932. How much solution could be heated to boiling by the heat evolved by the dissolution of 21.5 of ?
Calculate the mass of nitrogen dissolved at room temperature in an 98.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
The reaction is Ba(NO3)2(aq)+Na2so4(aq)toBso4(s) + 2NaNo3 (aq). The final the mixture increasing to 28.1 C degree. Calculate the enthalpy change per mole for this process.
Calculate the mole fraction of ethanol (CH3CH2OH, molar mass = 46.0 g/mol) in a solution that contains 46 g of ethanol and 64 g of methanol (CH3OH)
Calculate the mass (in grams) of sucrose in 1.0 kg of a 0.25% sucrose solution.
Is the melting of wax a physical or chemical change? from the mass measurement only,( the mass of the candle at 0 minute is 10.1g, after 30 minutes is 7.4g)
If 112 g of CaO and 224 g of NH4CI are mixed the theoretical yield of NH3 is 68.0 g. If only 16.3 g of NH3 of NH3 is actually obtained, what is the percent yield ?
Write balanced equations for the reactions of calcium metal with each of the following elements. A. H2 B. O2 C. S8 D. F2. E. N2 F. P4. You can answer only one, however, please give a step by step ex
Calculate the freezing point of a solution made from 22.0 g of octane (C8H18) dissolved in 148.0.g of benzene. Benzene freezes at 5.50 oC and its Kf value is 5.12 oC/m
A 0.0100 m solution is found to freeze at -0.040°C. Calculate the apparent percent dissociation of X2Y. Kf for water = 1.86°C/m.
A solution that contains 55.0 g ascorbic acid (vitamin C) in 250 g of water freezes at - 2.34 oC. Calculate the molar mass (g/mol) of the solute.
Question: A mixture of 8.7 g CH4, 3.6 g helium, and 6.3 g nitrogen is placed in a container and the total pressure is found to be 0.48 atm. Find the partial pressure of helium.
Suppose that 1.10 mg of gold is obtained in a colloidal dispersion in which the gold particles are spherical, with a radius of 1.00 * 10^2 nm. (The density of gold is 19.3 g/cm^3.) What is the total
Question: The compound is packaged as a 10% solution (density 1.0 g/mol) in water. If your dentist injects 0.50 mL of the solution, what mass of procaine hydrochloride (in mg) is injected.
An acid solution is 0.100 M in HCL and 0.210 M in H2SO4. What volume of a 0.140 M KOH solution would have to be added to 450.0 ml of the acidic solution to neutralize completely all of the acid?
Our Sun is made up of several elements, mostly hydrogen and helium, but there are significant amounts of metallic ions in it chromosphere and photosphere.
When magnesium metal and hydrochloric acid are reacted, hydrogen gas is produced. If 4.5 liters of hydrogen is produced during the reaction, what is the mass in grams of this product?
A reaction vessel that initially contains only CO(g) and H2O(g) comes to equilibrium according to the equation below.
Which of the following species would be expected to have chemical properties most similar to those of the nitrogen atom?
How many orientations does the nucles have in a magnetic field? At what frequency would there be resonance in a field of 1.0T?
A proposed mechanism for the oxidation of nitrogen monoxide is given below along with relative rates of the elementary steps.
Question: For a given equilibrium reaction at 25 degrees celsius, the equilibrium coefficient is 1.5x10^ -4. If the value of the forward Arrhenius factor is 0.12 and the activation energy of the for
Explain why even though [16] annulene is not aromatic, it adds two electrons readily to form an aromatic dianion?
What is the concentration of the phosphoric acid solution if it required 25.12 mL of phosphoric acid to titrate the NaOH sample when dissolved in water?
A saturated solution was formed when 4.40×10-2 L of argon, at a pressure of 1.0 atm and temperature of 25 degrees C , was dissolved in 1.0 L of water. Calculate the Henry's law constant for ar