Answer:
H2 + Cl2 —> 2HCl
Explanation:
HCl can be made by the reaction of hydrogen gas and chlorine gas
hydrogen and chlorine are both diatomic elements
H2 + Cl2 —> HCl
but we need to balance the equation so that there are the same number of Hydrogen atoms and chlorine atoms on both sides of the equation:
H2 + Cl2 —> 2HCl
hope this helps :)