1. Find the molar mass of Na2CO3:

* Na (Sodium): 22.99 g/mol * 2 = 45.98 g/mol

* C (Carbon): 12.01 g/mol

* O (Oxygen): 16.00 g/mol * 3 = 48.00 g/mol

Total molar mass of Na2CO3 = 45.98 + 12.01 + 48.00 = 105.99 g/mol

2. Use the molar mass to convert moles to grams:

* grams = moles * molar mass

* grams = 0.277 mol * 105.99 g/mol

* grams = 29.4 g

Therefore, 0.277 mol of Na2CO3 corresponds to 29.4 grams.