Final answer:
To react with 2.0 moles of aluminum, 6 moles of hydrogen chloride are required according to the stoichiometry of the reaction. This is because 1 mole of aluminum reacts with 3 moles of HCl.
Step-by-step explanation:
To determine how many moles of hydrogen chloride (HCl) are needed to react with a given number of moles of aluminum (Al), we need to look at the stoichiometry of the chemical reaction between aluminum and hydrogen chloride. The balanced chemical equation would look something like:
2Al + 6HCl → 2AlCl₃ + 3H₂
According to the stoichiometry of the reaction, 2 moles of aluminum (Al) react with 6 moles of hydrogen chloride (HCl) to form 2 moles of aluminum chloride (AlCl₃) and 3 moles of hydrogen gas (H₂).
Given that there are 2.0 moles of aluminum, and we see from the stoichiometry that 1 mole of Al reacts with 3 moles of HCl, then:
2.0 moles Al * (3 moles HCl / 1 mole Al) = 6.0 moles HCl
Therefore, you would need 6 moles of HCl to react with 2 moles of aluminum, which corresponds to answer choice (D).