Final answer:
The mass of 5.0 moles of lithium (Li) is calculated by multiplying the number of moles by the molar mass of lithium (6.94 g/mol), yielding a result of 34.7 grams.
Step-by-step explanation:
To calculate the mass in grams of 5.0 moles of lithium (Li), we use the concept of molar mass, which is the mass of one mole of a substance. The molar mass of lithium can be found on the periodic table and is approximately 6.94 g/mol. To find the mass of 5.0 moles of Li, we multiply the number of moles (5.0) by the molar mass of Li (6.94 g/mol).
The calculation is as follows:
Mass = moles × molar mass
Mass = 5.0 moles × 6.94 g/mol
Mass = 34.7 grams of Li
This result means that 5.0 moles of lithium have a mass of 34.7 grams.