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A mineral containing iron(II) sulfide but no other sulfides is treated with excess hydrochloric acid to produce hydrogen sulfide. If a 3.15 g sample of the mineral yields 448 mL of hydrogen sulfide gas (measured at 0 °C and 760 mm Hg), what is the mass percentage of iron(II) sulfide in the sample? a.) 20.4 b.) 35.5 c.) 55.8 d.) 71.0
Ethyl chloride vapor decomposes by the first-order reaction C2H5Cl --> C2H4 + HCl The activation energy is 249 kJ/mol and the frequency factor is 1.6 X 10^14 s^-1 The rate constant at 730 K is 2.4 x 10^-4 s^-1. 1)
if you take a 12.5 mL portion of the stock solution and dilute it to a total volume of 0.600L what will be the concentration of the final solution?
25.00 mL of 0.25 M formic acid is titrated with 25.00 mL of .2500 M NaOh. What is the pH at the equivalence point?
How many molecules of carbon dioxide are produced when 123 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water.
if the initial water level in the graduated cylinder is 21.2 ml and the level rises to 27.7 ml after the object is placed in the cylinder, what is the volume of the object?
How much heat in kilojoules is needed to bring 1.30 kg of water from 33.7 to 97.1 °C (comparable to making four cups of coffee)?
Determine how many grams of methane is required to form 43.0 grams of CHCl3?
A 36.3 mL aliquot of 0.0529 M (aq) is to be titrated with 0.0411 M NaOH (aq). What volume (mL) of base will it take to reach the equivalence point?
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz
A 24 L sample of a gas at fixed mass and constant temperature exerts a pressure of 3.0 atm. What pressure will the gas exert if the volume is changed to 16 L?
A gas occupies 1.55 L at 0.80 atm. What pressure would the gas exert if the volume were allowed to increase to 3.50 L?
What is the boiling point of a solution made using 813g of sucrose, C12H22O11, in 0.275 kg of water,H2O.
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