Question

Ex X cat mai repede va rogg​

Answer 1

Răspuns:

-calculez masa si moli de acid din solutia data]

c=mdx100/ms---> md= cxms/100= 36,5x40/100g=14,6gHCl

m,apa= ms-md= 40-14,6=>25,4g apa

niu=m/M= 14,6g/36,5g/mol=0,4mol-

-deduc moli sare si H2 din ecuatia chimica

        2mol..........1mol.........1mol

Fe + 2HCl------> FeCl2 +  H2

     0,4mol.....x=0,2mol......y=0,2mol

a)  0,2molH2

b)  m,sare= niuxM= 0,2molx127g/mol= 25,4g FeCl2;  M,FeCl2=127g/mol

c=mdx100/ms, unde ms= md+m,apa= 25,4+250=>275,4g

c= 25,4x100/275,4=.............................calculeaza !!!!!!

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