Surely, the answer must depend on what else is on the menu!
I have had meals where the appetisers and starters were so good that I was full before the main courses arrived!
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Extrapolating from the answer to how may grains in a pound of rice, 29,000, (elsewhere in Answers.com) we get something like 64,000 grains in a kilogram (@ 2.2 lbs / kg). This could vary based on the kind of rice.
They are both the same weight. Though the mass of the rock would be a lot less than the much greater mass of the puffed rice.
It is not possible to give a sensible answer to the question. A square metre is a measure of area in 2-dimensional space whereas the mass of rice depends on the volume - a 3-dimensional measure - of rice. The height of the pile of rice will affect the mass of rice.
There are approximately 29,000 grains of rice in 1 kilogram. This number can vary slightly depending on the type and size of the rice grains. The estimation is based on the average weight and size of a single grain of rice.
There are precisely 5,539 grains of rice in a handful.