Question

48 g magneziu reactioneaza cu o solutie de acid sulfuricde concentratie c = 40%
a) calculati masa de sulfat de magneziu obtinuta
b) determinati masa solutiei de acid sulfuric utilizata
Se cunosc: A(Mg) = 24, A(S) = 32, A(O) = 16, A(H) = 1

Answer 1

48.......... md........... m g

Mg  +  H2SO4 => MgSO4 + H2

24 ......... 98............. 120

a)

=> m = 48x120/24 = 240 g

b)

=> md = 48x98/24 = 196 g H2SO4

stim ca c% = mdx100/ms

=> ms = mdx100/c = 196x100/40

=> ms = 490 g H2SO4