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To a sample of alkaline earth metal carbonate (MCO3; 0.250 g) was added 30.0 mL HCl (0.250 mL). Carbon dioxide gas evolved out from the solution. After the reaction was completed. The solution was back titrated with a NaOH solution (33.50 mL of 0.1500 M). (a) Write the reaction equation of MCO3 and HCl; (b) Calculated the Molecular Mass of MCO3. (c) Determine what is this sample: CaCO3 ; MgCO3; or BaCO3 ?
A 5.00 g sample of KBr at 25.0°C dissolves in 25.0 mL of water also at 25.0°C. The final equilibrium temperature of the resulting solution is 18.1°C.
Iron reacts with chlorine gas as follows: 2 Fe (s) + 3 Cl2 (g) > 2 FeCl3 (s)
Calculate Ecell for the following electrochemical cell at 25 °C Pt(s) | H2(g, 1.00 atm) | H+(aq, 1.00 M) || Pb2+(aq, 0.150 M) | Pb(s) given the following standard reduction potentials.
A gas is compressed from initial volume of 5.60L to 1.23L by an external pressure of 1.00atm. During the compression the gas releases 128J of hear. What is the internal energy of the gas?
A 1.0-L buffer solution is 0.105M in HNO 2 and 0.145M in NaNO 2. Determine the concentrations of HNO 2 and NaNO 2 after addition of 1.4g NaOH.
The average concentration of strontium ion in seawater is 8.00 mg of strontium ion per kg of seawater. What is the molarity of the strontium ion if the density of the seawater is 1.025 g/mL.
A 250-L tank is evacuated and connected to a 50.0-L bulb filled with compressed argon. After they are joined, the pressure in the bulb falls to 2.20 atm.
an average concentration of dissolved gold of 5.8*10^?9 g/L. (a) How many grams of gold are in the ocean? (b) How many m^3 of gold are in the ocean?
Calculate the entropy change when argon at 25 °C and 1.00 bar in a container of volume 0.500 dm3 is allowed to expand to 1.000 dm3 and is simultaneously heated to 100 °C.
A liquid has a H vaporization of 35.5kJ/mol and a boiling point 0f 122 degrees celcius at 1.00 atm.What is its vapour pressure at 109 degrees celcius.
Organic Reactions - Cyclopentadiene, Why is cyclopentadiene monomer more stable at higher temperatures although dicyclopentadiene (dimer) is more stable at lower temperatures?
how many grams of K2SO4 would you need to prepare 1500g of 5.0% K2SO4 (m/m) solution?
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