Question

A small amount of aluminum reacts with hydrochloric acid (HCI) to form hydrogen gas and aluminum chloride Write and balance the equation, and how many grams of AI are required to produce 0.10 grams of H2?

Answer 1

2.007grams

Explanations:

The balanced reaction between aluminium and hydrochloric acid is given as:

`2Al+6HCl\rightarrow3H_2+2AlCl_3`

Determine the moles of Hydrogen gas

`\begin{gathered} mole=\frac{mass}{molar\text{ mass}} \\ mole=(0.10)/(2.016) \\ mole=0.0496mole\text{ of }H_2 \end{gathered}`

According to stoichiometry, 2 moles of Aluminium produces hydrogen 3 moles of hydrogen:

`\begin{gathered} moles\text{ }of\text{ }Al=00496mole*(3)/(2) \\ moles\text{ of Al}=0.07441mole \end{gathered}`

Determine the mass of Aluminium

`\begin{gathered} Mass\text{ of Al}=mole* molar\text{ mass} \\ Mass\text{ of Al}=0.7441*(26.98g)/(mol) \\ Mass\text{ of Al}=2.007grams \\ \end{gathered}`

Hence the mass of Al required to produce 0.10grams of H2 is 2.007grams