Calculate the molar mass of Na2C03 in g/mol

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

What happens to isotopes that are unstable?

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