Question

va rog dau coroana!!​

Answer 1

Răspuns:

a)

(91,7×56 + 5,8 × 54 + 2,2 × 57 + 0,3 × 58 ) / 100 =55.912≈56u.a.m

b)

MFe=56g/mol

1 mol Fe..................56g.................6,022×10²³atomi

                          xg.......................24,088×10²³atomi

x= 24,088×10²³atomi×56/6,022×10²³atomi=224g Fe

c)

MFe=56g/mol

n=m/M → m=n×M=4×56=224gFe

Explicație: