Question

Convert mass to moles for both reactants. (round to 2 significant figures.)

Answer 1

Answer:

Explanation:

Given parameters:

Mass of CuCl₂  = 2.50g

Mass of Al  = 0.50g

Unknown:

Number of moles of CuCl₂ and Al  = ?

Solution:

To solve this problem, we must understand that the number of moles is a fundamental property used in stoichiometry calculations.

         Number of moles  = $\frac{mass}{molar mass}$

Molar mass of CuCl₂  = 63.6 + 2(35.5) = 134.5g/mole

Molar mass of Al  = 26.98g/mole

          Number of moles of  CuCl₂  = $\frac{2.5}{134.5}$  = 0.019moles

        Number of moles of Al  = $\frac{0.5}{26.98}$   = 0.019moles

Answer 2

Answer:

2.50g CuCl2 equals 0.019 moles

0.25g Al equals 0.0093 or .0093 moles

Explanation:

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