Predict the formula and name of a binary compound formed from the following elements: (a) na and h, (b) b and o, (c) na and s, (d) al and f, (e) f and o, (f) sr and cl.

Answer and Explanation:

(a) Na and H : The compound formed by Na and H  is sodium hydride which formula is NaH

(b) B and O : The compound formed by Ba and O is barium oxide which formula is BaO

(C) Na and S : The compound formed by Na and S is sodium sulfide which formula is

(D) Al and F : The compound formed by Al and F is aluminium fluoride which formula is

(E) F and O : The compound formed by  F and O is oxygen fluoride which formula is

(F) Sr and Cl : The compound formed by Sr and Cl is strontium chloride which formula is

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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%