Question

Se trateaza 11,7 grame clorura de sodiu cu acid sulfuric , rezultat ataca zincul metalic. Sa se determine masa clorura de zinc , rezultata la sfarsitul ......
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de aflat moli si grame x si y
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Answer 1

 
         11,7 g                                   xg
      2  NaCl +H2SO4 =Na2SO4 +2HCl
      2.58,5 g                                    2.36,5 g


MNaCl=23+35,5=58,5
MHCl=1+35,5=36,5

x=11,7.2.36,5:2.58,5=7,3 HCl            1mol HCl-------36,5g
                                                           a moli HCl------7,3 g
7,3g              y                                    a=7,3:36,5=0,2 moli HCl
2HCl + Zn = ZnCl2 +H2  
2.36,5g         136g

y=7,3.136:2.36,5=13,6g ZnCl2          1mol ZnCl2---------136 g
                                                            b moli ZnCl2-------13,6 g
                                                            b=13,6:136=0,1 moli ZnCl2