Question

The volumes of two or more gaseous substances in a chemical reaction can be directly related to their coefficients options:if standard temperature and pressure are maintained.if each mass equals 1 mol.if all of the reactants and products are gases.if constant temperature and pressure are maintained

Answer 1

In this case, we can refer to one of the laws of stoichiometry, Gay Lussac's law. This law tells us that: "In a reaction in which the temperature and pressure are constant, the volumes of all the gases involved in the reaction have a simple relationship to each other". It means that if for example in a water vapor reaction, we will need 2 volumes of hydrogen and 1 volume of oxygen reacting form 2 volumes of water vapor.

So, the answer will be the last one: If constant temperature and pressure are maintained