How much energy (in KJ) is required to convert 50.0g of ice at – 30 ˚C to steam at130˚C.

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Heat of fusion: Hf = 334 J/g, Q = m. Hf
Heat of vaporization: Hv = 2260 J/g, Q = m. Hv
2.1 J/g˚C Heat capacity (S) of solid water Q = m. S. ΔT
2.03 J/g˚C Heat capacity (S) of water vapor Q = m. S. ΔT
4.18 J/g˚C Heat capacity (S) of liquid water Q = m. S. ΔT

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

How can parts of a solution be separated by chromatography?

Calculate the mass of 0.750 mol of the following substance. na3po4. , i'm not quite sure on how to set up the problem to solve! : (