Using the following equation for the combustion of octane, calculate the heat associated combustion of 100.0 g of octane assuming complete combustion. The molar mass of octane is 114.33 g/mole. The molar mass of oxygen is 31.9988 g/mole.2C8H18+25O2→16CO2+18H2O;ΔH∘r xn = -11018 kJA. -11018 kJB. -4819 kJC. -602.3 kJD. -535.4 kJE. -385.5 kJ

Option B. -4819 kJ

Explanation:

Equation of reaction:

         Δ = -11018 kJ

Mass of octane, m = 100.0 g

Molar mass of octane, MM = 114.33 g/mol

Number of mole, n = Mass/ Molar mass

Number of mole of octane, n = m/MM

n = 100/114.33

n = 0.8746 mols

From the chemical equation above

2 mols of octane produced -11018 kJ of heat

1 mol of octane produces (-11018/2) kJ of heat = -5509 kJ oh heat

Therefore, o.875 mols of octane will produce (-5509 * 0.8746) kJ oh heat = -4819 kJ of heat.

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.

false

explanation:

boats, things on boats luggage are way more heavy then water.