For the reaction

\(C H_{3} C O O H \left(\right. l \left.\right) + 2 O_{2} \left(\right. g \left.\right) \)
\(\rightleftharpoons 2 C O_{2} \left(\right. g \left.\right) + 2 H_{2} O \left(\right. l \left.\right)\)

at 25°C and 1 atm. pressure, ΔH = –874 kJ. The change in internal energy (ΔE) is -
1. – 874 kJ
2. – 971.53 kJ
3. + 971.53 kJ
4. + 874 kJ

The maximum work done in expanding 16g ${\mathrm{O}}_2$ isothermally at 300 K and occupying a volume of 5 dm³ until the volume becomes 25 dm³ is-

1. –2.01$\times {10}^3$ J

2. 2.01×${10}^{-3}$ J

3. +2.81$\times {10}^3$ J

4. +2.01$\times {10}^{-6}$J