What is the total number of tetrahedral voids in 0.6 mole of compound that forms hcp structure?

Identify name of reaction when aldehyde or ketone react with $\mathrm{Zn}-\mathrm{Hg} /$ conc. HCl to give alkane.

What products are obtained when beryllium oxide is treated separately with aq. HCl and aq. NaOH solutions respectively?

Calculate internal energy change of a system if work done by the system is 8 J and heat supplied to it is 40 J .