We can’t answer this question without any information. There is no explanation of the lab, nor is there any data.
Answer:
The correct answer will be "18.25 g".
Explanation:
The given values are:
Specific heat,
C = 0.45 J/g・°C
Heat involved,
q = 801 J
Temperature,
ΔT = 120.0°C-22.5°C
= 97.5°C
As we know,
⇒ 
On substituting the given values, we get
⇒ 
⇒ 
Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure. They are classified as elements