What is the percent by mass of carbon in c10 h14 n2?

Easy definition for atom and atomic mass

What reaction is taking place? 02 + c3h8 = h20 + co2

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