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The purity of a sample containing zinc and weighing 0.198g is determined by measuring the amount of hydrogen formed while the sample reacts with an excess of hydrochloric acid. The determination shows the sample to be84.0% zinc. Explain what amount of hydrogen (measured at STP) was obtained?
A liguid stream in a refinery contains 0.20 mol propane/mol, 0.30 mol butane/mol and 0.50 mole pentane/mol. If the flow rate of the propane is 75 mol/min, what are the flow rates of the butane and pentane
Calculate the time it takes to deposit 0.100g of copper from a copper sulphate solution if a 3.50 amp current
32.00 mL of a 0.2500 M sodium hydroxide solution exactly neutralized a solution containing 0.5000 grams of a soluble solid acid that yields two moles of hydrogen ions per mole of acid when dissolved. Calculate the molar mass of the acid.
which compartment (A or B) will increase in volume for each of the following pairs of solutions separated by a semipermiable membranes: a) A.20%(m/v) starch B.10%(m/v) starch. b) A.10%(m/v) albumin B.2%(m/v) albumin. c) A. .5%(m/v) sucrose B. 5%(m..
What volume (in mL) will it occupy at the same pressure and 277 K? Round your answer to zero places past the decimal.
write a balanced half-reaction describing the reduction of gaseous dioxygen to aqueous oxide
Mixtures of ethanal and water do not behave Raoult' s law. Describe the deviation from Raoult' s law in words and with a graph.
A 0.291 mol sample of PCl5(g) is injected into an empty 4.35 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.
a patient needs to take 625 of ibuprofen twice daily. the pills in the bottle are each 250. . how many pills does the
A 0.200 L sample of H2 is collected over water at a temperature of 298 K. Atmospheric pressure is 99.00 kPa. Water has a vapor pressure of 23.00 Torr at this temperature. What is the mass of the sample of gas which was collected
morphine c17 h19 no3 is often used to control severe post-operative pain. what is the ph of the solution made by
How many milliliters of water must be added to a stock solution of 6.00 M HNO3 in order to prepare 500 mL of 0.200 M HNO3 by dilution.
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