What was the total weight (lbf) of chocolate in the vat? the specific gravity of chocolate is approximately 1.24?

I believe this question is missing some information, but I'll just tell you how to solve it and you can apply using the information you have.

First, we have the specific gravity which is the ratio between the density of the substance to the density of water at 4 degrees celcius (1000 kg/m^3)
specific gravity of milk = density of milk/density of water
1.24 = density of milk/1000
density of milk = 1240 kg/m^3

Then we have:
density = mass/volume
I believe the question should have any information regarding the volume.
You will use this information to calculate the mass of milk in kg.

Then, you will change the kg to pound (lb) using cross multiplication. 
(1 kg = 2.2 lb).

The last step is to calculate the weight in lbf. To do this, you will simply multiply the mass (in lb) by the gravity (9.8 m/s^2)

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.