Question

What is the mass produced of Hydrogen gas (H2), when 0.500g Hydrochloric acid (HCl) completely reacts to the following reaction. Zn + 2HCl → ZnCl2 + H2

Answer 1

Mass = 0.014 g

Step-by-step explanation:

Given data:

Mass of HCl = 0.500 g

Mass of hydrogen gas produced = ?

Solution:

Chemical equation:

Zn + 2HCl → ZnCl₂ + H₂

Number of mole of HCl :

Number of moles = mass/molar mass

Number of moles = 0.500 g / 36.5 g/mol

Number of moles = 0.014 mol

Now we will compare the moles of HCl with hydrogen.

HCl : H₂

2 : 1

0.014 : 1/2×0.014 = 0.007

Mass of hydrogen gas:

Mass = number of moles × molar mass

Mass = 0.007 mol × 2 g/mol

Mass = 0.014 g