Most of the metal in the Model-T, a car built by Henry Ford from 1908 to 1926, was an alloy of steel and vanadium. Mixing a small amount of vanadium in with the steel makes it a little lighter, but it still maintains much of its strength. There are two isotopes of vanadium: V-50 (49.947 amu) and V-51 (50.944 amu). What is the percent of abundance of each isotope if the average atomic mass of vanadium is 50.942?

The element that has the greatest electronegativity is

Find the mass, in grams, of 5.00*10^23 molecules of f2

The chemical composition of soil varies with depth. an article in communications in soil science and plant analysis describes chemical analyses of soil taken from a farm in western australia. fifty specimens were each taken at depths 50 and 250 cm. at a depth of 50 cm, the average no3 concentration (in mg/l) was 88.5 with a standard deviation of 49.4. at a depth of 250 cm, the average concentration was 110.6 with a standard deviation of 51.5. find a 95% confidence interval for the difference in no3 concentrations at the two depths.