In this stoichiometry problem, determine the limiting reactant: Aqueous copper(II) nitrate reacts with aqueous sodium sulfide to produce aqueous sodium nitrate and copper(II) sulfide as a precipitate. In this reaction 469 grams of copper(II) nitrate were combined with 156 grams of sodium sulfide to produce 272 grams of sodium nitrate. Select all that apply.

The limiting reactant : Na₂S

Reaction

Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)

mol Cu(NO₃)₂ :(MW 187,56 g/mol)

mol Na₂S :(MW 78,0452 g/mol)

Limiting reactant(smaller ratio⇒ between mol and coefficient) :

1 mol Cu(NO₃)₂ : 1 mol Na₂S , so the limiting reactant : Na₂S( 2 < 2.5)

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

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