2. What is the mass of 0.38 moles of cobalt (Co)?

To find the mass of 0.38 moles of cobalt, you need to use the molar mass. Cobalt has a molar mass of approximately 58.93 grams per mole. So, you can calculate the mass by multiplying the number of moles by the molar mass: 0.38 moles × 58.93 g/mol = about 22.37 grams! Fun fact: Cobalt is not just an essential element for batteries and superalloys; it's also used to create vibrant blue pigments in glass and ceramics! This beautiful deep blue has been cherished in art for centuries, making cobalt literally a colorful choice in more ways than one. When dealing with moles and mass, a common mistake is miscalculating the molar mass or forgetting to include the unit conversions. Always ensure you double-check that your calculations align with the correct values and remember to keep your units consistent throughout the process!