Answer:
0.464 moles
Step-by-step explanation:
To find the number of moles in a given mass of a substance, you can use the formula:
Number of moles (n) = Mass (in grams) / Molar mass (in g/mol)
Cobalt has a molar mass of approximately 58.93 g/mol. So, to find the number of moles in 27.4 grams of cobalt:
n = 27.4 g / 58.93 g/mol ≈ 0.464 moles
There are approximately 0.464 moles of cobalt in 27.4 grams of cobalt.