30.A sample of oxygen gas is collected over water at 23℃ and
a barometer pressure of 751 torr. The vapor pressure of water at 23℃
is 21torr. What is the partial pressure of O2(g) in the collected sample?
(a) 21 torr
(b) 772torr
(c) 730torr ● 此題如何解呢?
(d) 728torr
IV. When heated, the DNA double helix separates into two random-coil
single strands. When cooled, the random coils reform the double helix;
(double helix) ←→ (2random coils)
(a) What is the sign of △S for the forward process? Why
(b) Energy must be added to overcome H-bounds and dispersion forces between
the strands. What is the sign of △G for the forward process when T△S
is smaller then △H
(c) Write an expression that shows T in terms of △H and △S when the
reaction is at equilibrium.(This temperature is called the melting
temperature of the nucleic acid).
●
這一題答案是大於0嗎?
它有加熱耶! 算自發嗎?
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