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Using Hess's Law and some or all of the equations (1) - (4) below calculate ΔH...

Using Hess's Law and some or all of the equations (1) - (4) below calculate ΔH at 25C for coal gasification: 2 C(coal) + 2 H2O(g)  CH4(g) + CO2(g) ΔH = ? 1. CO(g) + H2(g)  C(coal) + H2O(g) ΔH = −131 kJ/mol 2. C(graphite) + 2 H2(g)  CH4(g) ΔH = −74.8 kJ/mol 3. CO(g) + 3 H2(g)  CH4(g) + H2O(g) ΔH = −206 kJ/mol 4. CO(g) + H2O(g)  CO2(g) + H2(g) ΔH = −41 kJ/mol THE ANSWER IS +15KJ/MOL please show work and give me advice on how to tackle future problems

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