Calculate the moles of H2 present in this gas sample. . 9. 1.0 gram of water at 25 C is heated to 100 C, at which point it boils at an atmospheric pressure of 1 atm and is vaporized. (Assume the density of water is 1.0, which means the volume of liquid water at 25 C is 1.0 mL). A. What is the volume of water vapor produced? B. What is the difference in volume (in mL) between the water vapor and liquid water? (Assume the density of liquid water is 1.0 g/mL.) C. Why is it dangerous to heat a closed container of liquid to its boiling point?