НОМЕР 1.
Mr(Na2SO4) = 2 × 23 + 1 × 32 + 4 × 16 = 142
Mr(CaCO3) = 1 × 40 + 1 × 12 + 3 × 16 = 100
Mr(AlCl3) = 1 × 27 + 3 × 35,5 = 133,5
НОМЕР 2.
Mr(H3PO4) = 3 × 1 + 1 × 31 + 4 × 16 = 98
w(H)= 3 × 1 / 98 ≈ 0,03 × 100% = 3%
w(P) = 1 × 31 / 98 ≈ 0,32 × 100% = 32%
w(O) = 4 × 16 / 98 = 0,65 × 100% = 65%
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Answers & Comments
НОМЕР 1.
Mr(Na2SO4) = 2 × 23 + 1 × 32 + 4 × 16 = 142
Mr(CaCO3) = 1 × 40 + 1 × 12 + 3 × 16 = 100
Mr(AlCl3) = 1 × 27 + 3 × 35,5 = 133,5
НОМЕР 2.
Mr(H3PO4) = 3 × 1 + 1 × 31 + 4 × 16 = 98
w(H)= 3 × 1 / 98 ≈ 0,03 × 100% = 3%
w(P) = 1 × 31 / 98 ≈ 0,32 × 100% = 32%
w(O) = 4 × 16 / 98 = 0,65 × 100% = 65%