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a) 0,3 mola C₁₂H₂₂O₁₁ ------- x (g)
1 mol --------- 12*12g+22*1g+11*16g
x= 0,3*342/1
x= 102,6 g
b) 0,5 mola N₂O₅ ------ x (g)
1 mol ------- 2*14g+5*16
x= 0,5*108/1
x= 54 g
c) 4 mole H₂O --- x (g)
1 mol ---- 2*1g+16
x= 4*18/1
x= 72g