Give the nuclear symbol (isotope symbol) for the isotope of bromine, br, that contains 46 neutrons per atom.

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

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.