For the exothermic reaction 3h2(g)+n2(g)→2nh3(g) which of the following changes could be carried out in such a way as to not cause the reaction to shift either to the left or to the right?

a) raising the temperature and removing nh3
b) lowering the temperature and adding nh3
c) both a or b
d) neither a or b

the answer to your question is c.

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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%