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m= d·V
m= 1,11 g/ml ·1000ml= 1110 g (masa roztworu)
formaldehyd stanowi 40% roztworu czyli 0,40 ·1 110 g= 444g
444g( HCHO)--- x dm3
30g(HCHO)-----22,4 dm3
x= 331,52 dm3= 331,52l