The redox titration method was used to determine the chromium-containing samples. After sample decomposition, Cr (Ⅲ) was oxidized to Cr (Ⅵ), and then titrated by 0.1 mol/l Fe2+ solution. Given that the chromium-containing sample contains 10% chromium, please calculate how many sample should be weighed [填空1]g to consume 30 mL of Fe2+ solution. [Ar(Cr)=52.00]