Question

How many molecules of HCl are needed to react with 1.7 moles of magnesium. The products of
the reaction are magnesium chloride and hydrogen gas.
2HCl + Mg --> MgCl2 + H2
(pls help)

Answer 1

Answer:

2.05 x 10²⁴ molecules

Explanation:

The balanced equation for the chemical reaction is the following:

2 HCl + Mg → MgCl₂ + H₂

According to the equation, 2 moles of HCl are required to react with 1 mol of magnesium (Mg), so the moles of HCl required to react with 1.7 mol Mg are calculated as follows:

moles HCl = 1.7 mol Mg x 2 mol HCl/mol Mg = 3.4 mol HCl

We know that 1 mol of any compound is equal to 6.022 x 10²³ molecular entities, so we convert the moles of HCl to molecules as follows:

molecules HCl = 3.4 mol HCl x 6.022 x 10²³ molecules/1 mol = 2.05 x 10²⁴ molecules