Massetal (A)

Atommasse (M)

massen af hver enkelt isotop

\(M_F\) = formelmasse

\(M_F(H_20) = 2 \cdot M_F(H) + 1 \cdot M_F(O)\)

\(M_F(H_20) = 2 \cdot 1,008u + 1 \cdot 15,999u = 10,0015u\)

a) \(M_F(SO_2) = 1 \cdot M_F(S) + 2 \cdot M_F(O) = 1 \cdot 32,066u + 2 \cdot 15,999u = 64,064u\)

b) \(M_F(NH_3) = 1 \cdot M_F(N) + 3 \cdot M_F(H) = 1 \cdot 14,007u + 3 \cdot 1,0079u = 17,0307u\)

c) \(M_F(H_2SO_4) = 2 \cdot M_F(H) + 1 \cdot M_F(S) + 4 \cdot M_F(O) = 2 \cdot 1,0079u + 1 \cdot 32,066u + 4 \cdot 15,999u = 98,0778u\)

d) \(M_F(C_6H_{12}O_6) = 6 \cdot M_F(C) + 12 \cdot M_F(H) + 6 \cdot M_F(O) = 6 \cdot 12,011u + 12 \cdot 1,0079u + 6 \cdot 15,999u = 180,1548u\)