Cisplatin, empirical formula

Cisplatin, the common name for a platinum compound that is used to treat cancerous tumors, has the composition (mass percent) 65.02% platinum, 9.34% nitrogen, 2.02% hydrogen, and 23.63% chlorine. Calculate the empirical formula for cisplatin. 

The empirical formula for cisplatin is PtN2HgCl2. Note that the number for hydrogen is slightly greater than 6 because of rounding. 

We want to determine the empirical formula for cisplatin, PtaNbHcCld. That is, we want to solve for a, b, c, and d. 

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