Answer: The given mass in kilograms is 0.00399 kg
Step-by-step explanation:
Gram and Kilograms are the units which are used to express the mass of a substance. These units are inter changeable.
We are given:
Mass of a substance = 3.99 g
To convert the given mass into kilograms, we use the conversion factor:
1 kg = 1000 g
Converting the given value, we get:

Hence, the given mass in kilograms is 0.00399 kg