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A2 = 11
X1 = 19%
X2 = 81%
m at. = ?
Do obliczeń wykorzystuję wzór na średnią masę atomową
m at. = A1*X1% + A2*X2%/100%
m at. = 10*19% + 11*81%/100%
m at. = 190 + 891/100
m at. = 1081/100
m at. = 10,81u