Answer:
m = 7.42 kg
Step-by-step explanation:
Given that,
The specific heat of the soil, c = 1.700J/g C
The temperature of soil in a flowerpot increased from 15.6°C to 35.5°C.
The energy released from the Sun is 251175 J. We need to find the mass of the soil.
We know that,

or
m = 7.42 kg
So, the mass of the soil is equal to 7.42 kg.