When zinc is placed in hydrochloric acid (HCl). hydrogen gas and zinc chloride are produced. How many grams of HCl would need to react to produce 3.21 grams of hydrogen gas? Zn + 2HCl --> ZnCl2 + H2 a 115.88 g HCl b 84.83 g HCl c 28.38 g HCl d 42.42 g HCl

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