Question

Cat cantaresc 5 moli de clorat de potasiu si cati moli reprezinta 12,044 × 10 la puterea 24 molecule de apa oxigenata

Answer 1

Răspuns:

Explicație:

n =m :M            n=nr.moli  ; m=masa subst.   ;M=masa molara

m=n . M

m=5moli . 122,5 g /moli =612,6 g KClO3

MKClO3=39+35,5 +3.16=122,5---->122,5g/moli

120,44 .10²³molecule H2O2

1mol de molecule H2O2----------6,023.10²³molecule

x moli----------------------------------120,44 .10²³molecule

x=120,44 .10²³ : 6,023.10 ²³=19,99 aproximativ 20 moli H2O2

m=20moli . 34g/moli=680 g H2O2