Calculate the concentration of SO2(ppm) that must be reached in polluted air (in ppm) if the dissolved gas is to produce a pH of 3.8 in raindrops without any oxidation of the gas. Hint: Sulfurous acid equilibria
My question is that I don't know how to set up the problem to solve it with the equation to use. C-14 activity of the youngest mammoths was measured at 1.5 disintegrations per minute gram of carbon. How many years ago did the Siberian mammoths become extinct?
The pH in a lake the size of 2.0 km X 10.0 km and an average depth of 100m...
The pH in a lake the size of 2.0 km X 10.0 km and an average depth of 100m is found to be 4.5. Calculate the mass of calcium carbonate that must be added to the lake water in order to raise its pH to 6.0, assuming the reaction of H+ with CaCO3 gives CO2 here (answer in grams). Hint: Calculate volume of lake, change of H+ conc ...continues
I give up this one. Appreciate for any help!
9. Assume that due to dwindling supplies of crude oil and natural gas, the US embarks on a plan to implement the "hydrogen economy" for which hydrogen will be generated by electrolysis of water. The source of electricity is from photovoltaic (PV) conversion of sunlight in the southwestern US. (a) Assume that a flat plate PV syst ...continues
In 2000, the US accounted for one-fourth of the total world energy consumption and both the US and world rates were growing at a 3.5 percent annual rate. Suppose the US cut its growth rate to 1.1 percent, while the rest of the world growth propelled by the needs of developing countries, continued to increase by the historic rate ...continues
What reasons could there be for different water sample results at four sites along a river?
What reasons could there be for different water sample results at four sites along a river? (see files attached with data)
Easy 3-part problem - photosynthesis reaction
1) Photosynthesis is estimated to produce 339.99999 g (dry weight) of plant matter per square meter, 50% of which is carbon. Calculate the total number of grams of carbon "fixed" each year by 1000 square meters. 2) The photosynthetic reaction can be represented as: 6CO2 + 6H2O -> C6H12O6 + 6O2 Of the glucose produced, 40.0% i ...continues
Simple half-life question (based on disintegration per minute)
The well-preserved remains of a now extinct woolly mammoth is entombed in the permafrost lands of Siberia. Scientists have conducted carbon dating experiments on plant debris found in the stomachs of this mammoth. The C-14 activity of the mammoths was measured at 1.499999999999999 disintegration per minute per gram of carbon. ...continues
Ahort chem problem - involves precipitation
How much Fe++ could be present in water containing 1.4 x 1e-02 M HCO3- (bicarbonate) without causing the precipitation of FeCO3 (Ksp=10**(-10.7))
Simple 2-part question - heating water
14a) Should you install a solar water heater? The average home has a 200 liter hot-water tank, which is effectively drained and replenished three times per day. Assume that the entering tap water is 19 degrees Centigrade and is heated to 53 degrees Centigrade. Given an average energy from sunlight of 1.53 kJ/cm2 per day, how lar ...continues
