Question

Calculează masa de substanță din..(a)2,5 moli CO2
(B)10 moli HCI
(C)5 moli Br2
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Answer 1

n = nr moli = masa / M.moleculara

(A)2,5 moli CO2

=> masa = n x M.molec. = 2,5 x (1x12+2x16) = 2,5x44

=> masa = 110 g CO2

(B)10 moli HCI

=> masa = n x M.molec. = 10 x (1+35,5) = 10 x 36,5

=> masa = 365 g HCl

(C)5 moli Br2

=> masa = n x M.molec. = 5 x (2x80) = 5 x 160

=> masa = 800 g Br2