1) Calculate the mass of water:
m1 = ρ1 / V, where ρ1 is the density of water (ρ1 = 1000 kg / m3), V is the volume of water (V = 5 l = 5 dm3 = 5 * 10-3 m3).
m1 = ρ1 * V = 1000/5 * 10-3 = 5 kg.
Let’s calculate the mass of kerosene:
m2 = ρ2 / V, where ρ2 is the density of kerosene (ρ2 = 800 kg / m3).
m2 = ρ2 * V = 800/5 * 10-3 = 4 kg.
m2 / m1 = 5/4 = 1.25 times.
2) Since the volume of kerosene is equal to the volume of water:
m1 / m2 = ρ1 / ρ2 = 1000/800 = 1.25.
Answer: The mass of water is 1.25 times greater than the mass of kerosene.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.