Choose whether the reaction is exothermic or endothermic. 2C(s) + 2H2(g) → C2H4(9) -Select--
2H2(g) + O2(g) → 2H20() -Select--
N2(g) + 3H2(g) + 2NH3(g) --Select--

What record? the question is incomplete

Are you going to give an example of the plant or?

We first assume that this gas is an ideal gas where it follows the ideal gas equation. the said equation is expressed as: pv = nrt. from this equation, we can predict the changes in the pressure, volume and temperature. if the volume and the temperature of this gas is doubled, then the pressure still stays the same.

Ibelieve the answer is d. bleachhope my answer has you : )