Which change of phase is exothermic? A H
H2S(g) → H2S(1)
B. CO2(s) CO2().
C
H2O(s) –H2O(g)
D. NH3(1) NH3(9)

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?