Weight = mass x gravity. Assuming normal Earth gravity, you can divide the weight (in newton) by 9.8 to get the mass (in kilograms).
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That depends how big the desk is.
0.5804
3,900 is.
Close to the Earth's surface, each kilogram has a weight of about 9.8 newton. Thus, you must simply multiply the mass by 9.8 (newton/kilogram).
140*28=3920 thank you