What mass of carbon is present in 147.2 g of potassium ferrocyanide?

The molecular formula of potassium ferrocyanide is K4[Fe(CN)6]. 

Its molecular weight: 368.
368g  72g of carbon.
1g will contain = 72/368

Therefore,

147.2g (147.2*72)/368 = 28.8g of carbon.

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