Answer
Please see the work below.
Work Step by Step
We know that
$1.00\times L \times \frac{0.025mol\space Na_2CrO_7}{1L\space solution}\times \frac{262.0g\space Na_2CrO_7}{1mol\space Na_2Cr_2O_7}=0.6550g\space Na_2Cr_2O_7$
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