Write the mass-action expression, Qc , for the following chemical reaction. 
Definitions:
Pulmonary Semilunar
A term typically referring to the pulmonary semilunar valve, which is a valve of the heart situated between the right ventricle and the pulmonary artery, regulating blood flow to the lungs.
Right Ventricle
The lower right chamber of the heart that pumps oxygen-depleted blood to the lungs for oxygenation.
Pulmonary Trunk
A major blood vessel that carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.
Cushion the Heart
Likely refers to the protective layer around the heart, such as the pericardial fat or the pericardium, but without specific context, the term is ambiguous.
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