Half-life and rate constant for first order reaction are related by equation,

What is the conductivity of 0.02 M HCl solution if molar conductivity of the solution at 25$$^\circ$$C is 412.3 $$\Omega^{-1}$$ cm$$^{-1}$$ mol$$^{-1}$$ ?

Which among the following is a source of wool?

What is percentage atom economy during conversion of reactant to product if formula weight of reactants is 246 u and of product is 123 u?