SpaceX uses the MERLIN rocket engine to power its Falcon 9 and Falcon 9-heavy launch vehicles. In addition to commercial launch services, SpaceX uses the Falcon 9 to launch the dragon capsule to re-supply the International Space Station. The MERLIN rocket engine uses RP-1 (kerosene) fuel and liquid oxygen oxidizer. Kerosene contains a variety of hydrocarbons, but the main constituent is n-dodecane, which has chemical formula C12H26 and enthalpy of formation of -291,010 kJ/kmol. The total mass flow rate for the engine is 140 kg/s. a. Write out the chemical reaction for the combustion process of the MERLIN engine assuming stoichiometric combustion and only CO2 (44 g/mole) and H20 (18 g/mole) product species.
b. What is the molecular weight of the product mixture?
c. What is the enthalpy (or heat) of this reaction?
d. Determine an estimate for the temperature of the combustion products assuming the reactants enter the combustion chamber at 298K and only CO2 and H20 product species.
e. Determine an estimate for the thrust and specific impulse of this rocket motor assuming y=1.3. (SpaceX reports Ispvac = 304 sec, Fvae = 617 kN)

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

mark brainliest and have a great day!

i'm assuming that it's c.) red bank..

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.