Before coming to lab a plan is needed for the creation of 5 standard aqueous solutions of (NH4)3Fe(ox)3.3H2O with concentrations between 1.0 x 10-3 M and 7.5 x 10-3 M.   The first step is to create 25 mL of 0.012 M stock solution with (NH4)3Fe(ox)3.3H2O(s) and deionized water.  What is the formula weight of (NH4)3Fe(ox)3.3H2O? [ Select ] 392,03 406.02 428.06 391.99 What mass (in grams) of (NH4)3Fe(ox)3.3H2O is required to make such a solution? [ Select ] 0.040 0.121 1.34 0.128 What piece of glassware holds the 25 mL? [ Select ] graduated cylinder Erlenmeyer flask beaker volumetric flask If the digital scale in lab reports values to the thousandths place, how many significant figures can the actual stock solution concentration be reported with? [ Select ] 3 2 4 1 5  多重下拉选择题

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