Question

Calculați:
a). nr. moli(49g de subst)
b).M de subst(5 moli)
c). M de subst(196 g subst)
d).M cu 10g H
Pentru acid sulfuric

Answer 1

a)
moli H2SO4                se calculeaza masa moleculara a H2SO4
49 g H2SO4              M=2+32+4.16=98
                                  98 g H2SO4-----------1mol  H2SO4
                                  49 g H2SO4----------X moli H2SO4
                         X=49:98=0,5 moli H2SO4


b)
g H2SO4                     M=98
5moli H2SO4        
                                     98g H2SO4----------1mol
                                     x g----------------------5 moli
                                  x=98.5=490 g H2SO4

c)
moli H2SO4                 M=98
196 g H2SO4              98 g H2SO4----------1 mol H2SO4
                                  196 g----------------------------x
                                   x=196:98=2 moli H2SO4

d)
m H2SO4                    M=98
10 g H                      98 g H2SO4---------2g H
                                   X g ------------------10 gH
                          X=98.10:2=490 g H2SO4