Carbon dioxide is a green house gas that is linked to global warming. it is released into the atmosphere through the combustion of octane (c8h18) in gasoline. write the balanced chemical equation for the combustion of octane. (use the lowest possible whole number coefficients. omit states-of-matter from your answer.)
calculate the mass of octane needed to release 3.50 mol co2.

The equation for combustion of octane is given below. The mass of octane needed is 49.87 g.

Explanation:

Combustion reaction is a type of reaction in which a hydrocarbon in the presence of air (oxygen) decomposes into carbon dioxide and water.

Chemical equation for the combustion of octane is given by:

As, oxygen is taken in excess. Therefore, octane is considered as limiting reagent because it limits the formation of product.

By Stoichiometry,

16 moles of carbon dioxide is produced by 2 moles of octane.

So, 3.5 moles of carbon dioxide is produced by = of octane.

To calculate the mass of octane needed, we use the formula:

Molar mass of octane = 114 g/mol

Number of moles of octane = 0.4375

Putting values in above equation, we get:

Mass of octane needed = 49.87 g

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.