Calculate the mass of 2.50 × 104 molecules of nitrogen gas.

Does the energy in a solid increase or decrease when changing to a liquid?

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 description best characterizes the motion of particles in a solid?