Your chemistry teacher empties her dehumidifier once a day if the composite of the tank is 2 gallons determine how many molecules of water did the dehumidifier collect from the air per millisecond

Volume of water = 2 gal

1 gal = 3.78 L

2 gal = 7.56 L = 7600 ml

Density of water = 1 g/ml

Mass of water = 7600 ml x 1 g/ml = 7600 g

Molar mass of water = 18g/mol

Mole of water = mass of water / molar mass of water = 7600 g/18g/mol = 420 moles

According to Avogadro, 1 mole of water = 6.023 x 10²³ molecules of water  

Number of water molecules = 420 x 6.023 x 10²³= 2529.66 x 10²³molecules

Molecules of water collected in 1 day  = 2.53 x 10²⁶

= 2.93 x 10¹⁸ = 3 x 10¹⁸ molecules/msec

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.