Final answer:
To find the mass of 1.38 moles of calcium, multiply the number of moles (1.38) by the molar mass of calcium (40.08 g/mol), resulting in 55.3104 grams of calcium.
Step-by-step explanation:
To calculate the mass of calcium in grams for 1.38 moles of calcium, we use the concept of molar mass, which is the mass of 1 mole of a substance. The molar mass of calcium (Ca) is approximately 40.08 g/mol. To find the mass in grams of 1.38 moles of calcium, the calculation is straightforward:
Mass of Ca = Number of moles × Molar mass of Ca
Mass of Ca = 1.38 moles × 40.08 g/mol
Mass of Ca = 55.3104 grams
Therefore, 1.38 moles of calcium is equal to 55.3104 grams.