13,000 g
kilograms
10 kilograms
grams
825,000
You could (theoretically) use either... However - Kilos is the preferred measurement.
I think it is kilograms
290kg
The weight of a guitar could be determined in either kilograms or grams, but preferably in kilograms.
You would weigh a baseball bat in kilograms.
Grams
According to this can of Healthy choice I am holding, it measures the can in ounces and in grams. A kilograms is 1,000 (one thousand) grams. A can of soup is not likely to weigh that much.