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A beaker that contains 35.00 mL of water weighs 84.95 g, and the mass of an Alka Seltzer tablet weighs 2.98 g. Addition of the tablet into the beaker of water causes the Alka Seltzer tablet to produce carbon dioxide gas. After the reaction, the mass of the beaker, water, and the remains of the tablet weighs 87.42 g. What was the mass of the liberated carbon dioxide gas?
Analysis of water in a sediment sample at equilibrium at ph 7.00 showed [so42-] = 2.00 x 10^-5 m and a partial pressure of h2s of 0.100 atm. show with appropriate calculations if methane, ch4, would be expected in the sediment.
Calculate the concentration of SCN- present in the Hg22+/Cu+ solution when the first (initial) cation begins to precipitate, and the concentration of SCN- present in this solution when the second (final) cation begins to precipitate
In the gravimetric determination of Zn^2+, 2.2024 g sample was dissolved and made up to volume in a 100.0 mL flask. A 10.0 mL aliquot were precipitated by adding a soluble pyrophosphate salt and heating the precipitate to a solid Zn2P2O7 (304.728 ..
a solution is prepared by adding 30.00 g of lactose milk sugar to 110.0 g of water at 55 degc. the partial pressure of
Determine the final concentration of each of the following solutions after 20.0mL of water has been added.
a solution is prepared by dissolving 20.0 g of NaI in enoug water tomake 300.mL of solution How many moles of ions are in 25.mL of thesolution?
A 12.0 gas cylinder has been filled with 5.40 moles of gas. You measure the pressure to be 5.00 atm. What is the temperature inside the tank? Express your answer numerically in degrees Celsius.
500.0 g of ammonia react with 51.0 moles of sulfuric acid to produce ammonium sulfate. How many moles of excess sulfuric acid are left over after the reaction is complete?
a solution of ethanol c2h5oh in water is prepared by dissolving 63.5 ml of ethanol density 0.79 gcm3 in enough water
How many grams of chlorine gas must be reacted with excess sodium iodide if 20.0 moles of sodium chloride are needed?
Which solution behaves more ideally, a 5.0% by weight NaOH (aq) solution (b.p. = 102 ºC) or a 50. % NaOH (aq) solution (b.p. = 140. ºC) Support your answer with calculations (hint: what are the theoretical boiling points for these solutions).
you recrystallize 300 mg of solid material and obtain 200mg. what is your percent recovery. if you concentrate some of the mother liquor and obtain a further 40 mg, what is your total percent recovery
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