Carbon tetrachloride may be produced via the reaction between methane and chlorine gases: """CH4 (g) + 4 Cl2 (g) => CCl4 (l) + 4 HCl (g)"""

If this reaction generates 2.50 gallons of CCl4, how many pounds (lbs) of HCl were also generated? The
density of CCl4 is 1.5867 g/mL.

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I do not know how to approach this question because it features 4 different types of units: gallons...pounds...grams...mililiters...

An explanation would be appreaciated