Jeżeli jest napisane “powstanie z 10.44g”, a nie “powstanie z 10.44 czegoś”. To :
MnO_2 + 4HCl ---> MnCl_2 + Cl_2 + 2H_2O
M_M_n_O_2 = 55g + 16g*2 = 55g + 32g = 87g
M_H_C_l = 1g + 35g = 36g
4M_H_C_l = 36g * 4 = 144g
144g + 87g = 231g
a)
231g - 2 mole wody
10.44g - x
x = 2mole*10.44g/231g = 0.09mola
b)
M_M_n_C_l_2 = 55g + 35g*2 = 55g + 70g = 125g
231g - 125g
10.44g - x
x=125g*10.44g/231g = 5.65g
c)
231g - 1 mola Cl_2
10.44g - x
x=1mol*10.44g/231g=0.045mola
0.045mola * 22.4dm^3/mol = 1.008dm^3