In calculating the mass of the HRS, the amount of Freon used must be taken into

Question

In calculating the mass of the HRS, the amount of Freon used must be taken into account. If the HRS has a holding tank of 2.5 gallons and it is filled completely with Freon, what is the weight of Freon in units of pounds-force when the HRS has landed on Mars? The specific heat of Freon is 74 joules per mole kelvin. The specific gravity of Freon is 1.49

Please show how to convert 14.09kg to 11.572lb-force without the value of g on Mars. Or, likewise if mass = 5.25kg.

Please do not simply show D/m = V => 9.46L and mass = 9.46*1.49 = 14.09, as I know how to find these quantities. I just don't understand how to convert it to force without the value of g on Mars.

Thanks you.

Explanation / Answer

1 gallon = 0.00378 m3

2.5 gallons = 0.00946 m3

Mass = Density*Volume

=> m = 1.49*0.00946 = 0.0141 kg

1 kg = 2.205 lb

=> m = 0.031 lb

Value of g on mars = 3.73 m/s2

0.031*3.73 = 0.11563 lb-Force

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