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The following reaction is used to generate hydrogen gas in the laboratory. If 243 mL of gas is collected over water at 298K and have a total pressure of 745 mm Hg, what madd of hydrogen is produced? A possibly useful table of water vapor pressure is provided below.
Mg(s)+2HCl(aq) --> MgCl2(aq) + H2(g) T(Celcius) P(mm Hg)
20 17.55 25 23.78 30 31.86
calculate the number of joules given off when 32.0 grams of steam cools from 110.0 degc to ice at -40.0 degc. cp of h2o
NH3 is a weak base (Kb=1.8 x 10^-5) and so the salt NH4Cl acts as a weak acid. What is the PH of a solution that is 0.039 M in NH4Cl?
You would like to create a reflection grating like the one shown at the right, with an incident angle (θ) of 43 °. Calculate the number of lines per centimeter that should be etched in the grating for each of the following conditions:
The heat of fusion is 4.6 kJ/mol and the heat of vaporization is 46.0 kJ/mol. Finally, the specific heats of the solid, liquid and gas are, respectively 2.1, 3.2 and 1.8 J/g oC.
Triethyloxonium Tetrafluoroborate, (CH3CH2)3O+ BF4 - is a solid with melting point 91-92 degrees Celsius. Show how this reagent can transfer an ethyl group to a nucleophile (Nuc:-) in an SN2 reaction.
If you start with 1.000 g of sulfur (S8) and obtain 4.963 g of pure compound. What is the empirical formula of this compound?
What is the volume of .885 M hydrochloric acid required to react with (a) 25 mL of .288 M aqueous ammonia (b) 10 g of sodium hydroxide (c) 25 mL of a solution
What quantity of heat is required to melt 500. g of ice and heat the water to steam at 100. oC? What quantity of heat is required to melt 500. g of ice and heat the water to steam at 100. oC?
What us the partial pressure (in atm) of carbon dioxide and the partial pressure (in atm) of water vapor? (For the purpose of this question, assume ideal gas behavior.)
A given mass of radium is over a million times more radioactive than the same mass of uranium
Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 160.0 gallons.
A water sample is found to contain 23ppm iodine(I). If you drank 1399mL of this water, how many moles of Iodine(I) would you ingest
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