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A 4.50 g of hydrogen gas is produced when a sample of magnesium metal is reacted with an excess of hydrochloric acid solution according to the reaction below. How many moles of the magnesium metal were reacted?
Mg(s) + 2HCl(aq) ----> MgCl2(aq) + H2(g)
Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C: 44.4%; H: 6.21%; S:39.5%; O: 9.86%. What is its empirical formula
Calculate the activation energy for the following reaction if the rate constant for the reaction increases from 84.2 M-1s-1 at 497 K to 1310 M-1s-1 at 794 K.
A 19.5 mL portion of an HBr solution of unknown strength is diluted to exactly 232 mL. If 120.4 mL of this diluted solution requires 77.8 mL of 0.36 M NaOH to achieve complete neutralization, what was the strength of the original HBr solution
at equilibrium, it was found that the concentrations were: .0584M for H2, .0195M for N2 and .430M for NH3. What was the initial concentration of ammonia
Find the molar heat of reaction for each experiment in units of Kilo-Joules / (mole of Mg) by dividing the heat of reaction by the moles of Mg used.
Naturally occuring iodine has an atomic mass of 126.9045. A 12.3849 gram sample of naturally occurring iodine is acidentally contaminated with an additional 1.00070 grams of 129I, a synthetic radioisotope of iodine used in the treatment of certain..
consider the following observations taken on successive cloudless autumn mornings. on the first day a considerable
sr-90 has a half-life of 29.1 years. how long will it take for the activity of a sr-90 sample to decay from 6.5x103
Determine the molarity of a solution that contains 15.50mL of glycerol (C3H8O3, d= 1.265g/mL) in 225.0mL
which of the following would not be a suitable solvent for a grignard reaction and why? hexane methanol dimethyl ether
Both the meta- and para- forms of phenylene diamine are used in the production of Kevlar and Nomex, respectively. Why is a corresponding material with similar properties not made from ortho-phenylene diamine, and why is the ortho-form of the diami..
If a certain gas occupies a volume of 14 L when the applied pressure is 7.0 atm , find the pressure when the gas occupies a volume of 3.5L.
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