Question

14. El cobre reacciona con el ácido sulfhídrico, si se tiene 30g de cobre y 200g de ácido sulfhídrico calcular: la masa de CuSO4 que se forma.

Answer 1

                       Cu +  2 H2SO4 → CuSO4 +  2 H2O  +  SO2

Mm H2SO4 = 98 g/mol
            Cu = 63.54 g/mol
      CuSO4 =159.60 g/mol

a) calcular moles a partir de los gramos

n = masa/Mm

n (Cu) = 30 g/ 63.54 g/mol = 0.472 mol
n(h2so4) = 200 g/ 98 g/mol = 2.040 mol

b) calcular moles a partir de la ecuacion

n (CuSO4) = 0.472 mol Cu  x  1 mol CuSO4
                                                ````````````````````
                                                    1 mol Cu

n(CuSO4) = 0.472 mol

n(CuSO4) = 2.040 mol H2SO4  x 1 mol CuSO4
                                                       ``````````````````
                                                       2 mol H2SO4

n(CuSO4) = 1.02 mol

REACTIVO LIMITANTE: Cu

c) calcular masa de CuSO4

m = 0.472 mol x 159.6 g
                           ```````````
                               mol

m = 75.33 g CuSO4