Hydrogen may potentially be used in the future to replace gasoline as a fuel. Mo

Question

Hydrogen may potentially be used in the future to replace gasoline as a fuel. Most major automobile companies are developing vehicles that run on hydrogen. These cars are environmentally friendly because their only emission is water vapor. One way to obtain hydrogen for fuel is to use an emission free energy source such as wind power to form elemental hydrogen from water. What mass of hydrogen (in grams) is contained in 2.8 gallon of water? (The density of water is 1.00 g/mL, 3.785 L = 1 gal, 1000 ml = 1 L)

Explanation / Answer

volume of water=2.8 gallon=2.8*3.785*1000=10598ml

density of water=1.00g/ml

mass of water for 10598ml=10598ml*1.00g/ml=10598g

molar mass of water=18g/mol

18g of water contains 2 g of H

then 10598g of water cotains how many g of H

therefore the mass of H in 2.8 gallon of water=(10598*2)/18=1177.55g

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