Question

Chromium(III) oxide reacts with hydrogen sulfide (H₂S) gas to form chromium(III) sulfide and water:

Answer 1

From the stoichiometry of the reaction 214.71  g of H₂S is required.

The equation of the reaction is;

Cr₂O₃(s) + 3H₂S(g) ⟶Cr₂S₃(s) + 3H₂O(l)

Number of moles of Cr₂S₃ produced :

=  421 g/200 g/mol

= 2.105 moles

From the balanced reaction equation;

3 moles of H₂S produced 1 mole of Cr₂S₃

x moles of H₂S is required to produce 2.105 moles moles of  Cr₂S₃

x = 3 moles × 2.105 moles/1 mole

= 6.315 moles of H₂S

Hence;

Mass of H₂S required

= 6.315 moles of H₂S × 34 g/mol

=214.71  g

What is the molar mass?

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10²³ atoms, molecules, or formula units of that substance.

Is molar mass and atomic mass same?

Molar mass is the mass of the one mole of the compound whereas atomic mass is the mass of the individual unit of the compound. Basically, molar mass is the mass of an average of many elements of the compound and atomic mass is the mass of the atom.

Learn more about stoichiometry  reaction :

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