convert mass to moles for both reactants. (round to 2 significant figures.) 2.50 g cucl₂ equals moles 0.25 g…

Explanation:

Step1: Calculate molar mass of CuCl₂

The molar mass of Cu (copper) is approximately 63.55 g/mol and Cl (chlorine) is approximately 35.45 g/mol. For CuCl₂, molar mass $M_{CuCl_2}=63.55 + 2\times35.45=63.55 + 70.9 = 134.45$ g/mol.

Step2: Convert mass of CuCl₂ to moles

Use the formula $n=\frac{m}{M}$, where $m = 2.50$ g and $M = 134.45$ g/mol. So $n_{CuCl_2}=\frac{2.50}{134.45}\approx0.0186$ mol. Rounding to 2 significant - figures, $n_{CuCl_2}\approx0.019$ mol.

Step3: Calculate molar mass of Al

The molar mass of Al (aluminum) is approximately 26.98 g/mol.

Step4: Convert mass of Al to moles

Use the formula $n=\frac{m}{M}$, where $m = 0.25$ g and $M = 26.98$ g/mol. So $n_{Al}=\frac{0.25}{26.98}\approx0.00926$ mol. Rounding to 2 significant - figures, $n_{Al}\approx0.0093$ mol.

Answer:

0.019 moles for CuCl₂; 0.0093 moles for Al