Answer:
Copper
Explanation:
To find limiting reactant, convert reactant mass values to moles & divide each by respective coefficient of balanced equation. The smallest resulting value is the limiting reactant.
Cu + S => CuS
25g/64g·mol⁻¹ 27g/32g·mol⁻¹
= 0.391 mol Cu = 0.844 mol S
*Note on working the problem => please see note below.
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0.391/1 0.844/1
= 0.391 = 0.844
0.391 < 0.844 => Cu is limiting reactant*
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*NOTE: The above is a simple way to ID the limiting reactant; however, one must work problem from mole values, NOT results of dividing by coefficients.
