You probably meant to ask, "How many grams is in a kilogram?" Then the answer would be 1000. As your question stands, you are asking how much mass is in a certain distance, which doesn't make sense.
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There are no kilograms in a kilometer. There are a thousand grams in a kilogram and a thousand meters in a kilometer!
First of all it's GRAMS. Second of all ,there are 1000 grams in one killogram. Third, gram and kilometer do not represent the same dimensions, so you cannot convert between them. Kilometer is a unit of length. Gram is a unit of mass.
One kilometer is a unit of distance, while grams are a unit of mass. Therefore, the two units measure different things and cannot be directly converted into one another. To convert between the two units, you would need to know the density of the material in question.
The number is greater in grams, because a kilogram is 1000 grams. It's like kilometer and meter, the number is greater in meters because a kilometer is 1000 meters.
1000 meters = 1 kilometer. The prefix "kilo" means 1000, so the word kilometer literally means "1000 kilometers." Just like a kilogram means 1000 grams.