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b) M H2O = 2 * 1u + 16u = 18u
c) M Al2O3 = 2 * 27u + 3 * 16u = 102u
d) M Al(OH)3 = 27u + 3 * 16u + 3 * 1u = 78u
e)M NaCl = 23u + 35u = 58u
Proszę ;)
b)16+2=18u
c)3*16+2*27=102u
d)27+17*3=78u
e)23+35,5=58,5u