How Deep Would the Water Ice Layer Be on the Moon?

[GOsuchessplayer]

Homework Statement

During the Apollo missions, each lunar module decelerated toward the surface of the moon by the oxidation of "Aerozine-50" fuel. Aerozine-50 is a blend of hydrazine, N2H4, and dimethylhydrazine, CH3()2N2H2, 50% by mass in each component (known to infinite precision). Nitrogen tetroxide, N2O4, was used as the oxidizing agent.

c. Determine the depth in centimeters of the equivalent water ice layer (density = 0.92 g/cm3) deposited on the surface if spread evenly over a circle 1.8 km in diameter.

Homework Equations

Assume that 2701 kg of Aerozine-50 was used in each deceleration, and that each component underwent ideal combustion according to the following unbalanced reactions:
N2H4+N2O4→N2+H2O (1)
CH3()2N2H2+N2O4→N2+H2O+CO2 (2)

The Attempt at a Solution

All I'm asking is if the ice layer is going to be cylinder or a sphere? I know how to do the problem I'm just not sure which they'd like.

 

[Borek]

You have wrong parentheses in dimethylhydrazine, it should be (CH₃)₂N₂H₂.

Assume cylinder - at this scale surface of the Moon can be considered flat.