Question

In cate g carbonat de Potasiu vom gasi atata potasiu cat gasim in 70 g azotat de potasiu?​

Answer 1

m K2CO3

70 g KNO3

-se afla masele molare ale celor doua substante

MKNO3=39 + 14 + 48=101 ------>101 g/moli

MK2CO3=78 +12 + 48=138------> 138g/moli

-se afla masa de K din KNO3

101 g KNO3------------39g K

70g KNO3---------------xg K

x=70 . 39 : 101=27, 02 g K

-se afla masa de K2CO3 care contine 27 , 02 g K

138 g K2CO3----------78g K

yg K2CO3--------------27,02 g K

y=138 . 27,02 : 78=47,80 g K2CO3

Answer 2

Calculam masa moleculara a K2CO3=AKx2+AC+AOx3=39x2+12+16x3=138g/mol

Calculam masa moleculara a KNO3=AK+AN+AOx4=39+14+16x3=101

In 101g KNO3.......39gK

In 70g K2SO4.... x=27,02gK

In 138gK2CO3....78gK

In y=47,82g K2CO3........27,02gK