Please help huge part of my grade

What’s the percent by mass of carbon in c10h14n2

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?