Answer:
The answer to your question is A.
Pure substances can not be broken down into others, so they cannot be molecules
Explanation:
Answer is B. 780 million kilometers. Hope this helps!
C srry if im wrung i so hive b ad engish
The balance chemical reaction is
<span><span>2Al + 6HCl -</span>à 2AlCl3 + 3H2</span>
A
ssuming excess amount of HCl because it is not given
Mole Al reacted = 13.5 g ( 1 mole/ 27 g)
= 0.5 mole Al
Mole H2 = 0.5 mol Al ( 3 mole H2 / 2 mole Al)
<span> =
0.75 mole H2</span>
since at STP then 1 mole gas occupies 22.414 L
volume H2 = 0.75 mole (22.414 L / mol)
<span>= 16.8105 L H2</span>
