Answer: D
Explanation: Energy is neither created nor destroyed so the amount of reactants and products must be equal
Density = (mass) / (volume)
Mass = 0.150 kg = 150 grams
Volume = (length) · (width) · (height)
Volume = (2.5 cm) · (4.3 cm) · (1.98 cm)
Volume = 21.285 cm³
Density = (150 g) / (21.285 cm³)
Density = 7.05 g/cm³
As elements in period are arranged according to increasing atomic weight with isotope as protium deuterium and trotium of h2 so chemical property are same but physical property different in period ic table
