Răspuns:
-CALCULEZ MASA DE SARE PURA
p=m,purx100/m,impur---> m,pur=400x85/100g=340g sare pura
caclulez nr. moli de sare, stiind miu= 58,5g/mol
niu=m/miu= 340/58,5mol=5,81mol sare
calculez moli acid, din ecuatia chimica
2mol............1mol
2NaCl + H2SO4---> Na2SO4 + 2HCl
5,81mol...........x
x=11,62molH2SO4
calculez masa de acid, stiind miu,H2SO4= 98g/mol
m= niuxmiu= 11,62x98g=1139g H2SO4
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Explicație:
