One day, cars may run on fuel cells. fuel cells obtain energy from the synthesis of gaseous water from hydrogen and oxygen. if all cars switched from burning fossil fuels to fuel cells, which might you expect to also occur? a. an increase in the price of gasoline b. an increase in carbon dioxide emissions c. an increase in the number of gas stations d. an increase in the water vapor content of earth's atmosphere

d.an increase in the water vapor content of earth's atmosphere

Explanation:

Fossil fuels are fuels formed in the earth from plant or animal remains. It is mostly composed of coal, natural gas and petroleum. Combustion of fossil fuels also produces pollutants such as carbon dioxide, nitrogen dioxide and others.

Fuel cells are electrochemical cells that converts the chemical energy of a fuel and an oxidizing agent into electricity by use of redox reactions. They mostly involve use of hydrogen and oxygen which forms water as a bye product.

Thus if all cars switched from burning fossil fuels to fuel cells, an increase in the water vapor content of earth's atmosphere.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%