My answer will be B and D
huh???? thats makes ni sencse
Mass of water = 80 x 18
= 1440 grams
Specific heat of water = 4.186 J/gK
Heat absorbed from water = mCpΔT
= 1440 x 4.186 x (21.6 - 18.1)
= 21.1 kJ
Moles of NH₄NO₃ = 3.53 / (14 + 4 + 14 + 16 x 3)
= 0.044 mol
Heat of solution = 21.1/0.044 kJ/mol
= 480 kJ/mol
GPE = mgh
Where GPE is gravitational potential energy (J), m is the mass ob the object (kg), g is acceleration due to gravity (m/s²) and h is the height (m)
m = 4 kg
g = 9.8 m/s²
h = 3 m
By substitution,
GPE = 4 kg x 9.8 m/s² x 3 m
= 117.6 J
≈ 118 J
Hence, the answer is D
