Show the difference in the reactivity of Na, Ca, Mg, Al, Fe, Cu with H2O

Explanation:

Na react with H2O to form NAOH

2 Na+2H2O2NAOH + H2

Ca react with water and form calcium hydroxide

Ca + 2H2OCa(OH)2

Mg react with water and form Magnesium hydroxide

Mg +2H2O Mg(OH)2 however this coating of mg(oh)2 prevent it from further reaction

 Fe react with water and form ferric hydride

3Fe +H2O2 FeH +FeO

copper do not react with water

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explanation:

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%