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    A student carried out an experiment to find the mass of FeSO4.7H20 in an impure sample, X. The student recorded the mass of X. This sample was dissolved in water and made up to 250cm^3 of solution. The student found that, after an excess of acid had been added, 25.0cm^3 of this solution reacted with 21.3cm^3 of a 0.0150 moldm^-3 solution of K2Cr2O7. Use this information to calculate a value for the mass of FeSO4.7H20 in the sample X.

    I have calculated the moles of both Cr2O7 and Fe2+, with an overall equation. I am unsure how to get the mass.
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    It's easy to overthink this, i don't think the actual question asks for the mass of the impure sample as we don't know enough information to calculate that. But i''ve attached calculating the mass..Name:  22782150_1706905806000593_218499663_n.jpg
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