c) A methane hydrate has the formulae CH4•XH2O. Methane makes up 15% of the mass of 'methane hydrate'. Calculate the value of x. d) Methane, CH4, burns in oxygen. i. Write a balanced symbol equation for the complete combustion of methane to produce carbon dioxide and water only. ii. Calculate the mass of methane burned to produce 260dm³ of] carbon dioxide at room temperature and pressure. (1 mole of gas occupies 24dm³ at room temperature and pressure).

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