Final answer:
The balanced chemical equation for the formation of gaseous formaldehyde from elements in their standard states is C(s) + H2(g) + ½O2(g) → CH2O(g), where one mole of solid carbon reacts with one mole of diatomic hydrogen gas and half a mole of diatomic oxygen gas.
Step-by-step explanation:
To write a balanced chemical equation for the standard formation reaction of gaseous formaldehyde (CH2O), you would begin by noting the standard states of the constituent elements. Carbon and hydrogen are in their diatomic forms as gases, and oxygen is a diatomic gas as well. The standard formation reaction involves forming 1 mole of the compound from its elements in their standard states.
The balanced chemical equation for the formation of formaldehyde (CH2O) from its elements in their standard states is:
C(s) + H2(g) + ½O2(g) → CH2O(g)
In detail, the equation represents one mole of graphite (carbon in its standard state) reacting with one mole of diatomic hydrogen gas and half a mole of diatomic oxygen gas to produce one mole of formaldehyde gas as the product.