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Na-sód
Na-23u
O-tLen
O-16u
H-wodor
H-1u
23u-100%
x-40
Na-57,5%
16u-100%
x-40
O-40%
1u-100%
x-40
H-2,5%
mam nadzieje ze pomogłam
x%Na-23u
100%-40u
x%Na=23*100/40=57,5%
X%O=16u
100%-40u
x=16*100/40=40%
X%H=100%-40%-57,5%=2,5%