In a coffee-cup calorimeter, 1.60 g of NH4NO3 was mixed with 75.0 g of water at an initial temperature of 25.008C. After dissolution

In a coffee-cup calorimeter, 1.60 g of NH4NO3 was mixed with 75.0 g of water at an initial temperature of 25.008C. After dissolution of the salt, the final temperature of the calorimeter contents was 23.348C.

Explanation: mass of the solution m = 1.6 + 75 = 76.6 g fall in temperature = 25 – 23.34 = 1.66°C heat absorbed = mass x specific heat x fall in temperature = 76.6 x 1.66 x 4.18 = 531.5 J . = .5315 kJ . mol weight of ammonium nitrate = 80 g heat absorbed by 1.6 g = .5315 kJ heat absorbed by 80 g or one mole = 26.575 kJ enthalpy change ΔH = +26.575 kJ b ) enthalpy of hydration = 2630 kJ / mol lattice energy = enthalpy of hydration + enthalpy change = 2630 + 26.575 = 2656.575 kJ .

there are no statements provided but here is why: sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state. hope this

The answer is a) carbon-12

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