Jamal has a sample of a substance and was asked to determine the density of this substance. He measured the mass to be 20g and volume to be 5cm3. What is the density of the sample? A. 4 g/cm3
B. 0.25 g/cm3
C. 10 g/cm3
D. 100 g/cm3

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

The element that has the greatest electronegativity is