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152 atm = 2 atm
PV = nRT
2 × 24 × 10^-3 = n × 0,08 × 300
n = 0,002
M NH4OH = mol × (1000 ÷ mL)
= 0,002 × (1000 ÷ 500)
= 0,004
OH^- = √ Kb × M
= √ 10^-5 × 4 × 10^-3
= 2 × 10^-4
pOH = 4 - log 2 ⇒ pH = 10 + log 2