Răspuns:
x g 130 g y g
H2SO4 + Zn = ZnSO4 + H2
98 g 65 g 2 g
M = 2*1 + 1*32 + 4*16 = 98 g/mol (H2SO4)
a)
x = 98 * 130 / 65 = 196 g H2SO4 (pur)
c% = md / ms * 100 ==> ms = md * 100 / c% = 196 * 100 / 54 = 363 g solutie H2SO4
b)
y = 130 * 2 / 65 = 4 g H2
M = 2 g/mol (H2)
Vm = 22.4 l/mol (constanta in conditii normale p = 1 atm, t = 0C)
n = 4/2 = 2 moli de H2
n = V / Vm ==> V = n * Vm = 2 * 22.4 = 44.8 l