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1 L ------- 1000 mL
X ------- 250 mL
x = 250 mL x 1 L = 0.250 L
1000 mL
0.3 mol ----- 1 L
x ---- 0.250 L
x = 0.250 L x 0.3 mol = 0.075mol
1 L
1 mol -------- 106 g
0.075 mol --- x
x = 0.075 mol x 106 g = 7.95 g de Na₂CO₃
1 mol