Answer to Question #279879 in General Chemistry for Gracias

Question

12.5 of zinc trioxocarbonate (iv), zinc 03 were heated to a constant mass and residue treated with excess hydrochloric acid. Calculate the mass of zinc chloride that will be produced

Answer 1

Zn $=65,C=12,O=16,H=1,Cl=35.5$

ZnCO$_{3(s)}\to\>ZnO+CO_2$

$ZnO+2HCl\to\>ZnCl_2+H_2O$

Molar mass of $ZnCO_3=65+12+48$

$125g$

Molar mass of ZnCl$_2=136g$

Moles of ZnCO$_3=\frac{12.5}{125}=0.1$

Moles of ZnCl$_2=$ Moles of $ZnCO_3$

$=0.1$

Mass of ZnCl$_2=0.1×136g$

$=13.6g$