Question

Calcule as massas molares das substâncias abaixo:
a) C 12 H 12 O 6 (Frutose)
b) K 3 Fe(CN) 6 (ferricianeto de potássio)
c) C 12 H 22 O 11 (lactose)

Answer 1

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$\tt a)~\sf m_{C_{12}H_{12}O_6}=12\cdot12+12\cdot1+6\cdot16\\\sf m_{C_{12}H_{12}O_6}=144+12+96=252~g/mo\ell\\\tt b)~\sf m_{K_3 Fe(CN)_6}=3\cdot39+56+6\cdot(12+14)\\\sf m_{K_3Fe(CN)_6}=117+56+156=329~g/mo\ell\\\tt c)~\sf m_{C_{12}H_{22}O_{11}}=12\cdot12+22\cdot1+11\cdot16\\\sf m_{C_{12}H_{22}O_{11}}=144+22+176=342~g/mo\ell$