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Consider the following approximate figures relating to cigarette smoking and cancer. The death rate in the US population of 270 million is 15 deaths per 1000 persons per year. One-fifth of these deaths are from cancer and one-fourth of the cancer deaths are from lung cancer. Ninety percent of the lung cancer deaths occur among the sixty million people who smoke. How many deaths are there per year in the US from ?all causes How many cancer deaths? How many lung cancer deaths
Carbon dioxide is removed from the atmosphere of space capsules by reaction with a solid metal hydroxide. Theproducts are water and the metal carbonate
Concentrations of aerosol constituents are sometimes expressed as ppb (mole fraction) to enable comparison with gaseous concentrations expressed in ppb. The unit ppb (mole fraction) is evaluated as RT x concentration of aerosol constituent in nano..
The temperature of the calorimeter and its contents increases from 20.00 C to 23.69 C. What is the heat capacity of the calorimeter (J/C)
It is possible to define metallic character as we do in this book and base it on the reactivity of the element and the ease with which it loses electrons.
A mixture of Ar and N2 gases has a density of 1.439 g/L at STP. What is the mole fraction of each gas. Express your answers using four significant figures. Enter your answers numerically separated by a comma.
a 150.0 g sample of metal at 80 c is added to 150.0g of H2O at 20 c. the temperature rises to 23.3 c. assuming that the calorimeter is a perfect insulator, what is the specific heat of the metal?
In an experiment a 0.00400 mol/L solution of sodium thiosulfate is prepared. 20 grams of regular salt is placed in one beaker and 20 grams of Iodide salt is placed in another beaker. 3.0 grams is KI was placed into each beaker.
Calculate the mass of ascobic acid in the whole tablet( use mass of whole tablet) c) Calculate the %error in the mass of ascobic acid in one whole tablet
What is the hydrogen ion concentration of a solution when 2.334ml of acetic acid (60.05 g/mole) and 2.082 grams of sodium acetate (82.04 g/mole) are added to 500ml of water?
what doe the product and balanced equation of NaOH+NH4HCO3 come out to be. Also what would the product and balanced equation of CuSO4 + a nail be and NH4HCO3 + heat be
Students in the lab place some sodium chloride in the beaker and remassed it to obtain a mass of 73.25 grams using a digital balance. Find the mass of salt in the beaker.
If He(g) has an average kinetic energy of 4610 J/mol under certain conditions, what is the root mean square speed
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