04 Question (1 point) A 1.00-L solution contains 4.00*10-4 M Cu(NO3)2 and 1.00×10% Methylenediamine (en). The Ky for Cu(en)22 is 1.00 x 1020
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Cu?+ (aq) + 2en(aq) Cu(en)}+ (aq)
(cu(en)}" ]
(Cu2+ ][en]
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What is the concentration of Cu2(aq) in the solution?
2.6
x 10-13 M
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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%

the answer is option a.

може ли да зареждате повече информация, моля