The combustion of ethanol, c2h5oh(l), in oxygen to form carbon dioxide gas and water vapor is shown by which balanced chemical equation?
a) c2h5oh(l) + o2(g) → co2(g) + h2o(g)
b) c2h5oh(l) + 3o2(g) → 2co2(g) + 3h2o(g)
c) 2co2(g) + 3o2(g) → c2h5oh(l) + 3h2o(g)
d) 2co2(g) + 3h2o(g) → c2h5oh(l) + 3o2(g)

B

Explanation:

The last 2 answers can immediately be cancelled out as they're not combustion of ethanol, combustion in this context is not a reversable reaction so cannot be referenced in this way.

The answer is determined to be B just by simply counting the numbers of each of the elements on the reactants (left) side and the products (right) side and ensuring they're the same

In A on the reactants side there is 2C 6H 3O and on the products side there is 1C 3O and 2H its not equal so it is not correct

In B on the reactants side there is 2C 6H 7O and on the products side there is 2C 6H 7O its equal so this answer is correct

what does the table look like

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.