Question

Guys please I need an answer for this asap

Mg+2HCl -> MgCl2+H2

0.2 mole of mg reacted with 0.2 of HCl

What is the mass of hydrogen gas produced?

Answer 1

Mass of hydrogen gas produced = 0.2 g

Step-by-step explanation:

Given data:

Number of moles of Mg = 0.2 mol

Number of moles of HCl = 0.2 mol

Mass of hydrogen gas produced = ?

Solution:

Chemical equation:

Mg + 2HCl → MgCl₂ + H₂

Now we will compare the moles of of hydrogen with Mg and HCl.

Mg : H₂

1 : 1

0.2 : 0.2

HCl : H₂

2 : 1

0.2 : 1/2×0.2 = 0.1

HCl produced less number of moles of hydrogen gas it will act as limiting reactant.

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 0.1 mol × 2 g/mol

Mass = 0.2 g