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0.25 g of a sample of coal was analysed by combustion method. The increase in weights of the CaCl2 tube and the potash bulbs at

0.25 g of a sample of coal was analysed by combustion method. The increase in weights of the CaCl2 tube and the potash bulbs at the end of the operation was found to be 0.15 g and 0.55 g, respectively. Calculate the percentage of carbon and hydrogen in the coal.

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