What is the mass of 2.3 x 1021 atoms of bromine? 1.8 x 1023 g
1.7 x 1043 g
0.31 g
3.4 x 1012
4.8 x 105g

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.)

How have the greenhouse gasses increased from the year 2000 to 2018

Ineed ! i have no clue how to do this problem.