The mass of 0 .500 mole of Ba is 274.6 grams. True False

False<br /><br />To determine the mass of 0.500 mole of barium (Ba), we need to use the molar mass of barium. The molar mass of barium is approximately 137.33 grams per mole.<br /><br />To find the mass of 0.500 mole of Ba:<br /><br />\[ \text{Mass} = \text{moles} \times \text{molar mass} \]<br /><br />\[ \text{Mass} = 0.500 \, \text{mole} \times 137.33 \, \text{g/mole} \]<br /><br />\[ \text{Mass} = 68.665 \, \text{grams} \]<br /><br />Therefore, the mass of 0.500 mole of Ba is 68.665 grams, not 274.6 grams.