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

Mass = 0.014 g

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

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plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.