- In a system at equilibrium, are there any processes happening?

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The half-life of thorium-230 is 7.54 ✕ 104 years. What is the decay constant for thorium? 2-logx=log5 Hi could someone tell me if my answer for x is correct?
x=20? Find ∆H for reaction of C2H6 gas (∆H°f=-84.7 kJ/mol) with oxygen gas to produce gaseous carbon dioxide (∆H°f=-393.5 kJ/mol) and liquid water? How do I evaluate this mathematical problem? 0.1 kg cork at the end of a 0.2m string at a speed of 2m/s is twirled. what's the cork's acceleration?