1. Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the reaction. CH4(g) + NH3(g) → HCN(g) + 3H2(g) 128.4 kJ Calculate the enthalpy change, AH, using the following equations: copper form N2(g) + 3H2(g) → 2NH3(g) ΔΗ- -91.8 kJ C(graphite) + 2H2(g) → CH48) AH = -74.9 kJ H2(g) + 2C(graphite) + N2(g) → 2HCN (g) AH = 270.3 kJ %3D

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.