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Grams of Cu₂S : 125.259 g
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Limiting reactants are reactants that limit the outcome of the reaction. Where if two substances are reacted there is a possibility that both substances are used up or one is used up and the other is left.
The method that can be used to find limiting reactants :
divide the number of moles of known substances by their respective coefficients, and the small quotient will be used up or as a limiting reagent
Reaction:
[tex]\tt 2Cu+S\Rightarrow Cu_2S[/tex]
To determine the Cu₂S formed, we determine the limiting of the reactants and determine its mole
100g of copper is heated with 50g of sulfur
[tex]\tt \dfrac{100}{63.546}=1.574[/tex]
[tex]\tt \dfrac{50}{32.065}=1.56[/tex]
[tex]\tt \dfrac{1.574}{2}\div \dfrac{1.56}{1}=0.787\div 1.56[/tex]
So Cu ⇒Limiting reactants
[tex]\tt \dfrac{1}{2}\times 1.574=0.787[/tex]
mass
[tex]\tt =mole\times molar~mass~of~Cu_2S\\\\=0.787\times 159.16\\\\=125.259~g[/tex]
the mass in grams of 3.5 mol of the element gold.
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the mass percent
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