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Question: zinc and castor oil ointment zinc oxide 75 g castor...

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ZINC AND CASTOR OIL OINTMENT 

Zinc oxide 7.5 g

castor oil 50.0g 

cetostearyl alcohol 2.0 g

white beeswax 10.0 g 

arachis oil 30.05 g

The Wt/mL of castor oil is 0.95g

 

The volume of castor oil required to make 500 g of this ointment is? 

A. 210 mL

B. 225 mL 

C. 237 mL

D. 250mL

E. 263 mL

 

I was told the answer is E, but I dont know how. My apprcoah was this:   50.95g /100 * 500= 254.75mL, but apparently it is not right  

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