Based on two of the mole ratios between substances in a chemical reaction, which is the correct equation for the chemical reaction?

d) A  + 2B   →   3C

Explanation:

In given question the there are one mole of reactant A two moles of reactant B and three moles of product C are present.

1 mol A / 2 mol B                 1 mol A / 3 mol C

A : B     1 : 2                          A : C     1 :  3

So from given information option D is correct.

A  + 2B   →   3C

Here in this equation one mole of A , two moles of B and three moles of C are present.

Other options are incorrect because,

a) 3A  + 2B   →   C

In this chemical equation three  moles of A two moles of B and one mole of C are present. So it is incorrect.

b) A + B →   C

In this chemical equation one mole of A one mole of B and one mole of C are present. So it is incorrect.

C) 6A +6B →   2C

In this chemical equation six moles of A six moles of B and two mole of C are present. So it is incorrect.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.