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Methane gas (CH4) comprises 7 x 10-5 % by mass of the Earth's atmosphere. What is the residence time of the gas in the atmosphere if it is being lost to the methane sinks at the rate of 4 x 1011 kg yr-1.Estimated mass of the Earth's atmosphere = 5 x 1018 kg.
how much energy is required to warm 100g of H2O from 20 degrees celcius to 80 degrees celcius if it is initially in a 140g glass flask? the specific heat of water is 4.18 J/g degree celcius.
Half-life equation for first-order reactions: (the 1/2 in t1/2 is a subscript) t1/2=0.693/k where t1/2 is the half-life in seconds (s) , and k is the rate constant in inverse seconds (s^-1).
what is the molar concentraion of the salt solution formed n this reaction? B. what is the molar concentraion of the excess reactant once this reaction has finished?
Gas stoichiometry and Percentage of calcium carbonate in the sample
Consider all the valence electron pairs of the central atom-both those that are shared in covalent bonds, called bonding pairs, and those that are unshared, called non-bonding pairs or unshared pairs.
If 0.345 moles are produced during a reaction and collected at a temperature of 294K and pressire of .981 atm what volume will the gas occupy?
Use the molar volume of a gas at STP to determine the volume (in {rm L}) occupied by 15.0 {rm g} of neon at STP.
For the following reaction, 5.07 grams of carbon disulfide are mixed with excess chlorine gas. The reaction yields 9.09 grams of carbon tetrachloride.
nickel acetate in a volumetric flask and add water to a total volume of 375 mL What is the concentration of the nickel cation? What is the concentration of the acetate anion?
A stock solution is prepared by adding 21 mL of 1 M AlCl3 to enough water to make 76 mL. What is the Cl- concentration of 40 mL of the stock solution?
What is the molarity of a solution prepared by dissolving 4.92 g of calcium nitrate, Ca(NO3)2, in 250 mL of water? (The molar mass of Ca(NO3)2 is 164 g/mol.)
Determine the range of fat you might expect to obtain if you extracted fat from ten grams of nutmeg (Dried, ground nutmeg typically contains between 20-25% fat by weight.) Assume that your extraction is 95% effective.
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