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Temperature

The value of ...

Question

The value of △ S for freezing of 10 g of H_2O_{(l) }( enthalpy of fusion is 80 cal/g) at 0^0 C and 1 atm pressure is (1) 12.25 J/K (2) -0.244 J/K (30 -2.93 J/K (4) -12.25 J/K.

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(in J/K)

10 g

H_{2} O (l)

80 cal/g

0^{\circ} C

1 atm

1 cal = 4.2 J

0.05 k g

373 K

0.45 k g

253 K

L_{f u s i o n} = 80 c a l / g = 336 J / g

L_{v a p o r i s a t i o n} = 540 c a l / g = 2268 J / g

S_{i c e} = 2100 J / k g K = 0.5 c a l / g K

S_{w a t e r} = 4200 J / k g K = 1 c a l / g K

[Δ H_{f u s i o n} = 6.025 k J m o l^{- 1}]

64 g

1 a t m

0.1 a t m

30^{o} C .

Calculate $Δ_{r} S_{s y s}^{\otimes}$ for the following reaction at 373 K:

$C O (g) + H_{2} O (g) \to C O_{2} (g) + H_{2} (g)$

$Δ_{r} H^{\otimes} = - 4.1 \times 10^{4} J, Δ_{r} S_{u n i v}^{\otimes} = 56 J / K$

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