Zinc (Zn) combines with hydrogen chloride (HCI) to form
hydrogen gas (H₂) and zinc chloride (ZnCl₂).
Which equation represents this chemical reaction?
A. ZnCl₂ + Zn
B. 2HCI
→
→
H₂ + Zn + ZnCl₂
OC. ZnH₂ + ZnCl₂ + 2HCI
H₂ + 2HCI i know the answer but why is it 2HCI where does the 2 come from?