Which among the following is $NOT$ an intensive property?

Among the following,the set of parameters that represents path functions is:
$(a) \ q + w$
$(b) \ q$
$(c) \ w$
$(d) \ H - TS$

Identify the equation in which the change in enthalpy is equal to the change in internal energy.

What is the work done at $300 \ K$ for the reaction?
$SO_{2(g)} + \frac{1}{2} O_{2(g)} \rightarrow SO_{3(g)}$ (in $J$)?
(Given $R = 8.314 \ J \ K^{-1} \ mol^{-1}$)

The work done during reversible isothermal expansion of one mole of hydrogen gas at $25^{\circ}C$ from a pressure of $20 \ atm$ to $10 \ atm$ is
(Given $R = 2.0 \ cal \ K^{-1} \ mol^{-1}$)

One mole of a gas occupying $3 \ L$ volume is expanded against a constant external pressure of $1 \ bar$ to a volume of $15 \ L$. Calculate the work done by the system.