How many moles are in 3.4 x 10^-7 molecules of silicon dioxide, SiO2?

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

Give more examples of this type of heat transfer:

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).