When you are doing an experiment that will have multiple trials, how do you handle averages?
A. Do not put each individual trial in the data table, average them and just put the
average in the table.
B. Averages do not need to go in the data table, the reader can calculate it if they
need to know it.
C. The individual trials and the averages should each have their own columns in the
data table.
O D. Averages should never be used, they will cause rounding errors in the data.
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1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.