Question

Determine as massas molares dos seguintes composto:
a) K2Cr2O7 (K= 39; Cr=52; O=16)
b) N(CH3)3 (N=14; C=12; H=1)
c) Zn(C2H3O2)2 (Zn=65; C=12; H=1; O=16)
d) Al2(SO4)3 (Al=27; S=32; O=16)
e) Ca(NO3)2 (Ca=40; N=14; O=16)

Answer 1

a)
MM K₂Cr₂O₇ = 2 . 39 + 2 . 52 + 7 . 16 = 78 + 104 + 112 = 294 g

b)
MM N(CH₃)₃ = 1 . 14 + 3 . 12 + 9 . 1 = 14 + 36 + 9 = 59 g

c)
MM Zn(C₂H₃O₂)₂ = 1 . 65 + 4 . 12 + 6 .1 + 4 .16 = 65 + 48 + 6 + 64 = 183 g

d)
MM Al₂(SO₄)₃ = 2 . 27 + 3 . 32 + 12 . 16 = 54 + 64 + 192 = 310 g

e) 
MM Ca(NO₃)₂ = 1 . 40 + 2 .14 + 6 . 16 = 40 + 28 + 96 = 164 g