Astudent is running an experiment in which 74.8 grams of bai2 is needed, but the only jar of reagent in the lab is labelled barium iodide dihydrate. how many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound? 3

The number of grams of hydrated that  student must weigh out in order to get desired amount of the anhydrous compound is  81.68 grams

find the molar  mass of   Bai2 and molar mass of barium iodide dihydrate

that is Bai2 = 137.3 +(2x127)=391.3 g/mol

Bai2. 2H2O = 137.3+(2 x127) +2 (2+16)=427.3g/mol

using ratios  and letting the mass of hydrate  be represented by Y

427.3/391.3=Y/74.8

multiply both side by 74.8

Y=81.68 grams

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

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