Consider the reactions given below. On the basis of these reactions find out which of the algebraic relationship given in options (a) to (d) is correct?
$1. C (g) + 4 H (g) \to C H_{4} (g); Δ_{r} H = x k J m o l^{- 1} 2. C (g r a p h i t e) + 2 h_{2} (g) \to C H_{4} (g); Δ_{r} H = y k J m o l^{- 1}$
(a) x = y
(b) x = 2y
(c) x > y
(d) x < y

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Solution

(c)

Same bonds are formed in reaction (1) and (2) but no bonds are broken in reaction (1) whereas bonds in the reactant molecules are broken in reaction (2). As energy is absorbed when bonds are broken, energy released in reaction (1) is greater than that in reaction (2) hence, x > y

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Q. Consider the reactions given below. On the basis of these reactions find out which of the following relations is correct?

(i) C_{(g)} + 4 H_{(g)} \to C H_{4 (g)}; △_{r} H = x k J m o l^{- 1} (i i) C (g r a p h i t e, s) + 2 H_{2 (g)} \to C H_{4 (g)}; △_{r} H = y k J m o l^{- 1}

Q. Consider the reaction given below. On the basis of these reactions find out which of the algebraic relations given in options (A) to (D) is correct?
(i)

C_{(g)} + 4 H_{(g)} \to C H_{4 (g)}; Δ_{r} H = x k J m o l^{- 1}

(ii)

C_{(g r a p h i t e, s)} + 2 H_{2 (g)} \to C H_{4 (g)}; Δ_{r} H = y k J m o l^{- 1}

On the basis of theromochemical equations( 1), (2) and (3), find out which of the algebraic relationships given in options (a) to (d) is correct
$1. C (g r a p h i t e) + O_{2} (g) \to C O_{2} (g); Δ_{r} H = x k J m o l^{- 1} 2. C (g r a p h i t e) + \frac{1}{2} O_{2} (g) \to C O (g); Δ_{r} H = y k J m o l^{- 1} 3. C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g); Δ_{r} H = z k J m o l^{- 1}$
(a) z = x + y
(b) x =y - z
(c) x =y + z
(d) y =22 - x

Q. Consider the reactions given below. On the basis of these reactions find out which of the following relations is correct?

(i) C_{(g)} + 4 H_{(g)} \to C H_{4 (g)}; △_{r} H = x k J m o l^{- 1} (i i) C (g r a p h i t e, s) + 2 H_{2 (g)} \to C H_{4 (g)}; △_{r} H = y k J m o l^{- 1}

Q. Consider the reactions given below. on the basis of these reactions find out which of the algebric relation given in options (i) to (iv) is correct ? (i)

C (g) + 4 H (g) \to C H_{4} (g); Δ H = x k J

m o l^{- 1}

(ii)

C (g r a p h i t e) + 2 H_{2} (g) \to C H_{4} (g); Δ H = y k J

m o l^{- 1}

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Consider the reactions given below. On the basis of these reactions find out which of the algebraic relationship given in options (a) to (d) is correct? 1. C(g)+4H(g)→CH4(g); ΔrH=x kJ mol−12. C(graphite)+2h2(g)→CH4(g); ΔrH=y kJ mol−1 (a) x = y (b) x = 2y (c) x > y (d) x < y

(c) Same bonds are formed in reaction (1) and (2) but no bonds are broken in reaction (1) whereas bonds in the reactant molecules are broken in reaction (2). As energy is absorbed when bonds are broken, energy released in reaction (1) is greater than that in reaction (2) hence, x > y

(c)

Same bonds are formed in reaction (1) and (2) but no bonds are broken in reaction (1) whereas bonds in the reactant molecules are broken in reaction (2). As energy is absorbed when bonds are broken, energy released in reaction (1) is greater than that in reaction (2) hence, x > y