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A 0.521-g sample of a compound is dissolved in enough water to form 100.0 mL of solution. This solution has an osmotic pressure of 2.45 atm at 25°C. If each molecule of the solute dissociates into two particles (in this solvent), what is the molar mass of this solute?
How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 80.0 minutes?
What is the molarity of a solution containing 1.35 mol H2SO4 in 245 mL of solution
Calculate the pH of a buffer made with 0.50 M phosphoric acid and 0.75 M sodium dihydrogen phosphate. Ka = 7.5 x 10^-3
You place ethanol of 100 grams and water of 100 grams in a refrigerator. both are at room temperature Initially,. Determine which of the two liquid samples will cool faster and also explain why this happens.
Calculate the difference in the ionization energies for 1H and 4He atoms. This result allows you to compare the effect on the ionization energy of changing the nuclear charge
The pH of a sample of rain is found to be 4.0. Calculate the percentage of HSO4- that is ionized in this sample, given that the acid dissociation constant for the second stage of ionization of H2SO4 is 1.2E-2.
a 250ml solution of NaOH has 20g of solute. what is the concentration in moles per litre? what is the concentration of each ion?
If 72.4 kJ of heat is supplied to a 842 g block of metal, the temperature of the metal increases by 9.0°C. Calculate the specific heat capacity of the metal in J/g·°C.
A 5.00 % m/m glucose solution has d = 1.02 g/mL. What is the mass of glucose in 362 mL of the solution.
The Kp for the reaction below is 1.49 × 108 at 100.0 °C: CO (g) + Cl2 (g) ↔ COCl2 (g)
A gas has a volume of 10 L at 0 degrees C. What is the final temperature of the gas in C if its volume increases to 27 L? Assume that amount of the gas and its pressure remain unchanged.
what will happen if a small amount of HCl is added to a 0.1M solution of HF? a. the percent ionization of HF will decrease. b. Ka for HF will increase
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