Question

Oxidul de magneziu cu masa de 2g a fost tratat cu o solutie de hcl cu partea de masa 10% si densitatea =1,05gcm3 .calculati v solutiei de hcl consumat in reactie

Answer 1

2g        x
MgO+2HCl=MgCl2+H2O
40g   2*36,5g

$M_{MgO}=A_{Mg}+A_O=24+16=40g/mol$

$M_{HCl}=A_H+A_{Cl}=1+35,5=36,5g/mol$

$x=\frac{2*2*36,5}{40}=3,65g$

$c=\frac{x*100}{m_s}=\textgreater m_s=\frac{100x}{c}=36,5g$

$V=\frac{m_s}{\rho}=34,76cm^3$