The combination of coke and steam produces a mixture called coal gas, which can be used as a fuel or as a starting material for other reactions. If we assume coke can be represented by graphite, the equation for the production of coal gas is?

The combination of coke and steam produces a mixture called coal gas, which can be
used as a fuel or as a starting material for other reactions. If we assume coke can be
represented by graphite, the equation for the production of coal gas is
(3) CH (g) H O (g) 3 H (g) CO (g) H 206.1kJ
(2) CO (g) H O (g) CO (g) H (g) H - 41.2 kJ
(1) C(s) H O (g) CO (g) H (g) H 131.3 kJ
standard enthalpies of reaction :
Determine the standard enthalpy change for this reaction from the following
2 C (s) 2 H O (g) CH (g) CO (g)

Answer 1

#""_"rxn"ΔH = "+15.3 kJ"#

The formula for coal gas formation is

#"2C(s)" + "2H"_2"O(g)" → "CH"_4("g") + "CO"_2("g")#

Our goal equation is this one, which we have to get from equations (1) through (3).

We start with Equation (1), because it contains #"C(s)"#. We also multiply it by 2 to get #"2C(s)"#. Then we add the other equations to eliminate compounds like #"CO and H"_2# that are not in our target equation:

2 × (3): #"2C(s)" + "2H"_2"O(g)" → color(red)(cancel(color(black)("2CO(g)"))) + color(blue)(cancel(color(black)("2H"_2"(g)"))); color(white)(mll)ΔH = color(white)(l)"262.6 kJ"# (2): #color(red)(cancel(color(black)("CO(g)"))) + color(orange)(cancel(color(black)("H"_2"O(g)"))) → "CO"_2("g") + color(blue)(cancel(color(black)("H"_2("g"))));color(white)(mmm) ΔH =color(white)(ll) "-41.2 kJ "# -(1): #color(red)(cancel(color(black)("CO(g)"))) + color(blue)(cancel(color(black)("3H"_2"(g)"))) → "CH"_4("g") + color(orange)(cancel(color(black)("H"_2"O(g)"))) ; color(white)(mml)ΔH =color(white)(l) "-206.1 J"# (4): #stackrel(——————————————————)("2C(s)" + "2H"_2"O(g)" → "CH"_4("g") + "CO"_2("g"));color(white)(mmmll) stackrel(———————)(ΔH = "+15.3 kJ")#

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Answer 2

Kai Bowman

$C + H_2O \rightarrow CO + H_2$

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.