please solve how much solid buffer needed for each of the solid buffers

Given the following:

SODIUM ACETATE: 136.08 g/mol

TRIS BASE: 121.14 g/mo)

HEPES: 238.03g/mol

SODIUM CITRATE: 294.1 g/mol

POTASSIUM PHOSPHATE (Monobasic): 136.08 g/mol

1. - polyprotic (phosphate OR citrate buffer; final pH=pKa2 ). monoprotic (Acetate, HEPES OR TRIS; final pH=pKo1). 2. Calculate how much solid buffer you need to weigh out to prepare 100mL of a 0.1M solution. Use the molecular weight indicated on the bottle