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0,4 = M / 23
Massa Na = 23 × 0,4 = 9,2 gram
0,4 = M / 14
Massa N = 0,4 × 14 = 5,6 gram
ok !
massa = mol.Mr
a. massa Na = 0,4.23
=9,2 gram
b. massa N = 0,4.14
= 5,6 gram