11 g 1,4 dm³
2 CnH2n+1COOH + Mg ------- (CnH2n+1COO)2Mg + H2
x 22,4 dm³
x=22,4dm³·11g/1,4dm³=176g
176g/2=88g
12n+2n+1+12+16+16+1=88
14n=42
n=3
0dp.: Wzór tego kwasu to C3H7COOH ( kwas butanowy ).
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11 g 1,4 dm³
2 CnH2n+1COOH + Mg ------- (CnH2n+1COO)2Mg + H2
x 22,4 dm³
x=22,4dm³·11g/1,4dm³=176g
176g/2=88g
12n+2n+1+12+16+16+1=88
14n=42
n=3
0dp.: Wzór tego kwasu to C3H7COOH ( kwas butanowy ).