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P= 76 cmHg= 1 atm
T= 27+ 273=300 K
1 * 24*10^-3 = n 0,08 * 300
24*10^-3 = 24n
n = 24*10^-3/24 = 1*10^-3
[H+] = 1*10^-3/250*10^3= 4*10^-3
pH = - log [H+]
= - log 4*10^-3
= 3-log 4 = 3 - 0,6 = 2,4
* = kali
^-3= pangkat -3