Identify the symbol used for water according to Dalton's atomic theory?

An ideal gas expands isothermally and reversibly from $$10 \mathrm{~m}^3$$ to $$20 \mathrm{~m}^3$$ at $$300 \mathrm{~K}$$, performing $$5.187 \mathrm{~kJ}$$ of work on surrounding, calculate number of moles of gas used.

Which among the following type of linkages is present in cellulose?

Zirconium is refined by