how many grams of sodium fluoride, NaF, are required to prepare 500 mL of a 0.200 M solution? (find moles first, then convert to grams.)

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397