Final answer:
The mass of 0.045 moles of Cr is 2.34 g.
Step-by-step explanation:
To calculate the mass of grams of 0.045 moles of Cr, we can use the molar mass of chromium (Cr). The molar mass of Cr is 52 g/mol. To convert moles to grams, we use the relationship:
Mass (g) = moles x molar mass
Therefore, the mass of 0.045 moles of Cr is:
Mass (g) = 0.045 mol x 52 g/mol = 2.34 g