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b) P 4 = 4 * 31 = 124u
c) KBr = 1 * 39 + 1 * 80 = 39 + 80 = 119u
d) H 2 S = 2 * 1 + 1* 32 = 2 + 32 = 34u
e) NH3 = 1 * 14 + 3 * 1 = 14+ 3 =17u
f) Na2 SO4 = 2 * 23 + 1 * 32 + 4 * 16 =46 + 32 +64 =142u
g) (NH4)2 CO3 = 2 * (14 + 1 * 4 )2 + 12 + 16 *3 = 2 * 18 + 12 + 48 = 36 + 12 +48 =96u
h)Mg3 (PO4)2 = 3 * 24 + 2 * (31 + 4 * 16 ) = 72 + 2 *(31 + 64) = 72 + 2 * 95 = 72 + 190 = 262u
i) MgO = 24 + 16 = 40u
j)Na F = 23 + 19 = 42u
k ) CaO = 40 + 16 = 56u
l) H2 SO4 = 2* 1 + 32 + 4 * 16 =2 + 32 +64 = 98u
Mam nadzieję, że pomogłam :):):)
:D