Which laboratory technique refers to the procedures that are carried out under sterile conditions?

Acompound is found to contain 6.1% hydrogen and 93.9% oxygen. find it’s empirical formula.

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 samples do the atoms have the least kinetic energy