Question

`You have to be careful about pouring drano down your pipes since it is mainly hydrochloric acid--you can't do it if they are made of aluminum because it will dissolve them! You can't acid clean your aluminum auto parts for the same reasons: 2 Al + 6 HCl → 2 AlCl3 + 3H2. If you wanted to make 10.0 moles of hydrogen gas, how many many moles of Al would you need? NOTE: All numbers located immediately after elemental symbols should be considered subscripts.

Answer 1

6.67 moles

Step-by-step explanation:

Given that:-

Moles of hydrogen gas produced = 10.0 moles

According the reaction shown below:-

`2Al + 6HCl\rightarrow 2AlCl_3 +3H_2`

3 moles of hydrogen gas are produced when 2 moles of aluminium undergoes reaction.

Also,

1 mole of hydrogen gas are produced when
`(2)/(3)` moles of aluminium undergoes reaction.

So,

10.0 moles of hydrogen gas are produced when
`(2)/(3)* 10.0` moles of aluminium undergoes reaction.

Moles of Al needed =
`(2)/(3)* 10.0` moles = 6.67 moles