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21 July, 20:59

A mineral consisted of 29.4% calcium, 23.5% sulfur and 47.1% oxygen. What is the empirical formula?

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  1. 21 July, 21:04
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    Step one calculate the moles of each element

    that is moles = % composition/molar mass

    molar mass of Ca = 40g/mol, S = 32 g/mol, O = 16 g/mol

    moles of Ca = 29.4 / 40g/mol=0.735 moles, S = 23.5/32 = 0.734 moles, O = 47.1/16 = 2.94 moles

    calculate the mole ratio by dividing each mole with smallest mole that is 0.734

    Ca = 0.735/0.734 = 1, S = 0.734/0.734 = 1, O = 2.94 / 0.734 = 4

    therefore the emipical formula = CaSO4
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