Answer: option C. Sulphur
Explanation:
A. Heat is released, so the reaction is <u>exothermic</u>.
B. Heat is absorbed, so the reaction is <u>endothermic</u>.
C. Heat is released, so the reaction is <u>exothermic</u>.
Density = mass/volume
mass of metal =30.2 gram
volume of metal = 22.9-20 = 2.9mL
density = 30.2/2.9 =10.414 gram/mL