Complete each nuclear fission reaction. what is a?

143

Explanation:

Thinking process:

The equation is balanced by balancing the charges. This gives:

235 + 1 = 90 + A + 3(1)

236 =    90 + A + 3

236  = 93 + A

     A = 236 - 93

         = 143

therefore, the value of A is 143

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%

2b2t

explanation:

2b2t