Question

In the reaction below, 2.00 g of Al will react with how many milliliters of 0.500 M HCI?

2 Al(s) + 6 HCl(aq) → 2 AlCl3 (aq) + 3 H2(g)

Answer 1

420 mL

Step-by-step explanation:

Given data:

Mass of Al = 2.00 g

Molarity of HCl = 0.500 M

Millilitres of HCl react= ?

Solution:

Chemical equation:

2Al + 6 HCl → 2AlCl₃ + 3H₂

Number of moles of Al:

Number of moles = mass/ molar mass

Number of moles = 2.00 g/ 27 g/mol

Number of moles = 0.07 mol

Now we will compare the moles of Al with HCl.

Al : HCl

2 : 6

0.07 : 6/2×0.07 = 0.21 mol

Millilitres of HCl:

Molarity = number of moles / Volume in L

0.500 M = 0.21 mol / Volume in L

Volume in L = 0.21 mol / 0.500 M

Volume in L = 0.42 L

L to mL:

1 L = 1000 mL

0.42 L × 1000 mL / 1L

420 mL