How many liters of a 2.75 M NaCl solution do you need to obtain 0.250 moles of NaCl?

Which substances have the lowest melting points: ionic covalent, or metallic

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.)

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.